A Randomized, Double-Blind, Vehicle-Controlled, Parallel Group Study of the Dose-Response Profile of A-101 Topical Solution in Subjects With Seborrheic Keratosis of the Face
Phase: PHASE2
Conditions: Seborrheic Keratosis
Sponsor: Aclaris Therapeutics, Inc.

Aclaris Therapeutics, Inc. 
Protocol Number: A-101-SEBK-203 
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Date: 01-JUL-2014                                               -                                                Supersedes: 29-JUN-2014 
CLINICAL STUDY PROTOCOL 
 
Protocol Number: A-101-SEBK-203 
 
A RANDOMIZED, DOUBLE-BLIND, VEHICLE-CONTROLLED, PARALLEL 
GROUP STUDY OF THE DOSE-RESPONSE PROFILE OF A-101 SOLUTION IN 
SUBJECTS WITH SEBORRHEIC KERATOSIS OF THE FACE 
 
 
 
 
Sponsor 
Aclaris Therapeutics, Inc. 
101 Lindenwood Drive 
Suite 400 
Malvern, PA 19355 
Telephone: (484) 324-7933 
Facsimile: (484) 320-2344 
 
Study Contact 
Brian B. Beger 
Aclaris Therapeutics, Inc. 
101 Lindenwood Drive 
Suite 400 
Malvern, PA 19355 
Telephone: (484) 321-5552 
E-mail: bbeger@aclaristx.com 
 
Medical Monitor 
Stuart D. Shanler, M.D. 
Aclaris Therapeutics, Inc. 
101 Lindenwood Drive 
Suite 400 
Malvern, PA 19355 
Telephone: (484) 321-5555 
Serious Adverse Event facsimile: (484) 324-2359 
E-mail: sshanler@aclaristx.com 
 
 
 
This document is a privileged and confidential communication of Aclaris Therapeutics, Inc. Acceptance of this 
document constitutes an agreement by the recipient that no unpublished information contained herein will be used, 
published or disclosed without prior written approval from Aclaris Therapeutics, Inc. 

Protocol: A-101-SEBK-203 
Aclaris Therapeutics, Inc. 
 
 
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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
INVESTIGATOR/SPONSOR AGREEMENT 
 
I have read this protocol and I agree to conduct this study in compliance with the 
protocol and any applicable amendments. 
 
 
Investigator Signature: 
 
 
 
____________________________________ 
________________________ 
<Investigator Name> 
 
Date 
Investigator 
 
 
 
 
 
 
 
 
 
Sponsor Signature: 
 
 
 
____________________________________ 
________________________ 
Christopher Powala 
Date 
Chief Operating Officer 
Aclaris Therapeutics, Inc. 
 

Protocol: A-101-SEBK-203 
Aclaris Therapeutics, Inc. 
 
 
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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
Table of Contents 
INVESTIGATOR/SPONSOR AGREEMENT ...................................................................................... 2 
1. 
SYNOPSIS ........................................................................................................................................ 6 
LIST OF ABBREVIATIONS AND DEFINITIONS OF TERMS ...................................................... 9 
2. 
INTRODUCTION ......................................................................................................................... 11 
2.1. 
Summary ...................................................................................................................................... 11 
2.2. 
Study Rationale ........................................................................................................................... 12 
3. 
STUDY OBJECTIVES .................................................................................................................. 13 
4. 
SELECTION AND DISPOSITION OF STUDY POPULATION ......................................... 13 
4.1. 
Number of Subjects .................................................................................................................... 13 
4.2. 
Study Population Characteristics ............................................................................................ 13 
4.3. 
Inclusion Criteria ........................................................................................................................ 14 
4.4. 
Exclusion Criteria ....................................................................................................................... 15 
4.5. 
Previous and Concomitant Therapies ..................................................................................... 16 
4.5.1. 
Previous therapies .................................................................................................................... 16 
4.5.2. 
Concomitant therapies ............................................................................................................ 16 
4.5.3. 
Prohibited therapies ................................................................................................................ 16 
4.6. 
Subject Discontinuation from the Study ............................................................................... 17 
4.7. 
Subject Number (SN) ................................................................................................................. 17 
4.8. 
Replacement Subjects ................................................................................................................ 18 
5. 
INVESTIGATIONAL PLAN ...................................................................................................... 18 
5.1. 
Study Design ............................................................................................................................... 18 
5.2. 
Study Flow Chart ........................................................................................................................ 19 
5.3. 
Study Visits Description and Procedures .............................................................................. 20 
5.3.1. 
Visit 1 (Day -13 to 0) ................................................................................................................. 20 
5.3.2. 
Visit 2 (Day 1) ........................................................................................................................... 21 
5.3.3. 
Visit 3 (Day 8) ........................................................................................................................... 22 
5.3.4. 
Visit 4 (Day 22) ......................................................................................................................... 23 
5.3.5. 
Visits 5 (Days 29) ...................................................................................................................... 24 
5.3.6. 
Visits 6 and 7 (Days 50 and 78) .............................................................................................. 24 
5.3.7. 
Visit 8 (Day 106) ....................................................................................................................... 25 
5.4. 
Target Lesion Identification ..................................................................................................... 25 
5.5. 
Subject Instructions ................................................................................................................... 27 

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5.6. 
STUDY DURATION .................................................................................................................. 28 
5.7. 
STUDY MEDICATIONS .......................................................................................................... 28 
5.7.1. 
Study medication identity ...................................................................................................... 28 
5.7.2. 
Study medication packaging and labeling .......................................................................... 29 
5.7.3. 
Method of treatment assignment .......................................................................................... 29 
5.7.4. 
Subject randomization ............................................................................................................ 30 
5.7.5. 
Dispensing study medication ................................................................................................ 30 
5.7.6. 
Study medication application ................................................................................................ 31 
5.7.7. 
Dose compliance record .......................................................................................................... 33 
5.7.8. 
Dose modification .................................................................................................................... 33 
5.8. 
Study medication Management ............................................................................................... 34 
5.8.1. 
Accountability .......................................................................................................................... 34 
5.8.2. 
Return and disposition of study supplies ........................................................................... 34 
5.9. 
Other Study Supplies ................................................................................................................ 34 
5.10. 
Blinding ........................................................................................................................................ 35 
5.10.1. 
Verification of blinding .......................................................................................................... 35 
5.10.2. 
Un-blinding during the study medication .......................................................................... 35 
6. 
STUDY ASSESSMENTS ............................................................................................................. 36 
6.1. 
Effectiveness Evaluations ......................................................................................................... 36 
6.1.1. 
Subject’s Self-Assessment (SSA) .......................................................................................... 36 
6.1.2. 
Physician’s Lesion Assessment (PLA) .................................................................................. 37 
6.1.3. 
Lesion Dimensions .................................................................................................................. 38 
6.2. 
Safety Evaluations ...................................................................................................................... 38 
6.2.1. 
Local Skin Reactions (LSR) .................................................................................................... 39 
6.2.2. 
Vital signs .................................................................................................................................. 40 
6.2.3. 
Clinical laboratory sampling ................................................................................................. 41 
6.2.4. 
Urine pregnancy tests .............................................................................................................. 42 
6.3. 
Other Evaluations ....................................................................................................................... 42 
6.3.1. 
Demographics and medical history ...................................................................................... 42 
6.3.2. 
Standardized photography ..................................................................................................... 43 
7. 
ADVERSE EVENTS ...................................................................................................................... 43 
7.1. 
Definitions ................................................................................................................................... 43 
7.1.1. 
Adverse events (AE)................................................................................................................. 43 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
7.1.2. 
Serious adverse event (SAE) .................................................................................................. 45 
7.1.3. 
Unexpected adverse event ...................................................................................................... 45 
7.1.4. 
Adverse event reporting period ............................................................................................ 45 
7.1.5. 
Severity ...................................................................................................................................... 46 
7.1.6. 
Relationship to study medication ......................................................................................... 46 
7.2. 
Reporting Procedures ................................................................................................................. 46 
7.2.1. 
Procedures for reporting adverse events ............................................................................. 46 
7.2.2. 
Procedure for reporting a serious adverse event ................................................................ 47 
8. 
PREGNANCY ................................................................................................................................ 48 
9. 
STATISTICAL ANALYSES ........................................................................................................ 49 
9.1. 
Statistical Analysis of Clinical Indices ................................................................................... 49 
9.2. 
Statistical Analysis of Safety Data .......................................................................................... 50 
9.3. 
Sample Size .................................................................................................................................. 50 
10. 
TRAINING, MONITORING, DATA MANAGEMENT AND QUALITY 
ASSURANCE ................................................................................................................................. 51 
10.1. 
Training ........................................................................................................................................ 51 
10.2. 
Monitoring ................................................................................................................................... 51 
10.3. 
Data Management....................................................................................................................... 51 
10.4. 
Quality Assurance ...................................................................................................................... 52 
11. 
ETHICS AND GENERAL STUDY CONDUCT CONSIDERATIONS ............................... 53 
11.1. 
Institutional Review Board (IRB)/Ethics Committee (EC) .................................................. 53 
11.2. 
Ethical Conduct of the Study .................................................................................................... 53 
11.3. 
Subject Information and Consent ........................................................................................... 53 
11.4. 
Study Conduct and Protocol Amendments ........................................................................... 54 
11.5. 
Regulatory Documents .............................................................................................................. 54 
11.6. 
Contractual Requirements ........................................................................................................ 54 
11.7. 
Data Collection and Archiving ................................................................................................ 54 
11.7.1. 
Data collection .......................................................................................................................... 54 
11.7.2. 
Source documentation ............................................................................................................. 55 
11.7.3. 
Archiving ................................................................................................................................... 55 
12. 
SUBJECT INSTRUCTION SHEET ............................................................................................ 56 
 
 
 

Protocol: A-101-SEBK-203 
Aclaris Therapeutics, Inc. 
 
 
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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
1. 
SYNOPSIS 
Title: 
A Randomized, Double-Blind, Vehicle-Controlled, Parallel Group Study of the Dose-
Response Profile of A-101 Topical Solution in Subjects with Seborrheic Keratosis of the 
face. 
 
Objectives: 
The main objective of this study is to evaluate the dose-response relationship of two 
concentrations of hydrogen peroxide (A-101) solution (32.5% and 40%) when applied to 
individual seborrheic keratosis (SK) lesions (target lesions) on the face compared with a 
matching A-101 Solution Vehicle.  
 
Each subject will have one target lesion on the face. 
 
A further objective is to evaluate the safety and efficacy of two concentrations of A-101 
solution and its matching vehicle when applied to SK target lesions on the face. 
 
Methodology/Study Design: 
During this study, the investigator will identify 1 eligible SK target lesion on each 
subject’s face. The target lesion will be treated a maximum of two times.  
 
Approximately 108 subjects will be randomized to a study medication treatment group 
at multiple investigational centers. 
 
The duration of study participation is anticipated to be a maximum of 124 days per 
subject. This includes a screening period of up to 14 days, a visit for the required first 
study medication application, a visit 21 days later for an optional retreatment study 
medication application and an 84-day no treatment follow-up period. The final study 
visit (Visit 8) has a maximum allowable visit window of 4 days. Study visits are: 
 Visit 1 (Day -13 to 0) enrollment, start screening period 
 Visit 2 (Day 1) randomization; study medication application 
 Visit 3 (Day 8) no treatment follow-up 
 Visit 4 (Day 22) follow-up visit where target lesions that meet the retreatment 
criteria will receive a second study medication application 
 Visit 5 (Day 29) no treatment follow-up 
 Visit 6 (Day 50) no treatment follow-up 
 Visit 7 (Day 78) no treatment follow-up 
 Visit 8 (Day 106) no treatment follow-up; end of study. 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
At Visit 1, the investigator will identify 1 SK target lesion on the face for each subject for 
treatment and evaluation. Subjects may have more than 1 SK lesion, but only the target 
lesion will be evaluated and treated. The investigator will also collect blood samples for 
clinical laboratory safety tests to determine the subject’s eligibility for randomization.  
 
At Visit 2, the investigator will randomize eligible subjects and perform an initial study 
medication application. 
 
At Visit 3, subjects will be seen for a no treatment follow-up. 
 
At Visit 4, subjects will be seen for follow-up and any SK target lesion that meets the re-
treatment criteria (e.g., Physician’s Lesion Assessment [PLA] >0) will receive a second 
study medication application.  
 
At Visits 5 through 7, subjects will be seen for a no treatment follow-up. 
 
At Visit 8, subjects will be seen for a no treatment follow-up and will be discharged 
from the study. 
 
Number of Subjects: 
Approximately 108 subjects will be randomized in this study at multiple United States 
(US) investigational centers with a goal of 96 subjects completing the study. Each 
investigational center is expected to randomize approximately 36 subjects. Subject 
enrollment will be competitive. 
 
Diagnosis and Main Criteria for Inclusion: 
Subjects will be adult males and females with 1 clinically typical appearing SK target 
lesion on the face. 
 
Study Medications, Application, and Mode of Administration: 
There are 3 study medications: 
 A-101 Solution 40% 
 A-101 Solution 32.5% 
 A-101 Solution Vehicle. 
 
There are 3 treatment groups: 
 A-101 Solution 40% applied a maximum of 2 times to the target lesion 
 A-101 Solution 32.5% applied a maximum of 2 times to the target lesion 
 A-101 Solution Vehicle applied a maximum of 2 times to the target lesion.  
 
Subjects will be assigned to 1 of the 3 treatment groups in a random manner in a 1:1:1 
ratio. 
 

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Aclaris Therapeutics, Inc. 
 
 
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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
At Visit 2, after randomization, the investigator or designee, will perform, the study 
medication applications. 
 
At Visit 4, any target lesion that meets the retreatment criteria will receive a second 
study medication application (Section 5.7.6).  
 
Each subject will have the same study medication applied up to 2 times to the target 
lesion.  
 
Duration of Treatment: 
The planned treatment and study duration are: 
 Enrollment period: approximately 42 days 
 Subject participation period: up to 124 days 
 Study duration (first subject first visit through last subject last visit): 
approximately 166 days.   
 
Evaluations – Effectiveness: 
The investigator will evaluate the average overall severity of each subject’s SK target 
lesion using the Physician’s Lesion Assessment (PLA) and the subject will evaluate the 
target lesion using the Subject’s Self-Assessment (SSA). The investigator will measure 
the SK target lesion’s Lesion Dimensions throughout the study. 
 
Evaluations – Safety: 
The investigator and subject, as indicated, will evaluate Local Skin Reactions (LSR) for 
the target lesion. In addition, clinical laboratory safety tests, vital sign readings, 
concomitant therapies, urine pregnancy tests and adverse events (AEs) information will 
be assessed throughout the study. 
 
Evaluations – Other: 
Standardized color photographs to document the status of the target lesion will be 
taken throughout the study at 1 selected investigational center. 
 
Statistical Methods: 
The primary effectiveness will consist of the mean change from baseline to Visit 8 PLA 
performed using Analysis of Covariance (ANCOVA) with baseline PLA as the 
covariate. 
 
  

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
LIST OF ABBREVIATIONS AND DEFINITIONS OF TERMS 
Abbreviation 
Term 
AE  
Adverse Event 
ALT 
Alanine aminotransferase 
ANCOVA 
Analysis of Covariance 
AST 
Aspartate Aminotransferase 
BUN 
Blood Urea Nitrogen 
°C 
Degrees Centigrade 
CMH 
Cochran-Mantel-Haenszel 
CR 
 
Clinically Relevant 
CRA 
Clinical Research Associate 
CRF 
Case Report Form 
CRO 
Contract Research Organization 
e.g.  
for example (Latin; exempla gratia) 
EC 
Ethics Committee 
°F 
Degrees Fahrenheit 
FDA 
Food and Drug Administration 
G 
Gram 
GCP 
Good Clinical Practice 
HIPAA 
Health Insurance Portability and Accountability Act of 1996 
H2O2 
Hydrogen Peroxide 
IB 
Investigator’s Brochure 
ICF 
Informed Consent Form 
ICH 
International Conference on Harmonization  
i.e.  
that is (Latin; id est) 
IPL 
Intense Pulsed Laser 
IRB 
Institutional Review Board 
ITT 
Intent To Treat 
LDH 
Lactate dehydrogenase 
LOCF 
Last Observation Carried Forward 
LSR 
Local Skin Reactions 
MedDRA 
Medical Dictionary for Regulatory Activities 
mL 
Milliliter 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
Abbreviation 
Term 
Mm 
Millimeter 
NCR 
Not Clinically Relevant 
OTC 
Over-The-Counter 
PDT 
Photodynamic Therapy 
PLA 
Physician’s Lesion Assessment 
PP 
Per Protocol 
SAE 
Serious Adverse Event 
SK 
Seborrheic Keratosis 
SN 
Subject Number 
SOP 
Standard Operation Procedure 
SSA 
Subject’s Self-Assessment 
US 
United States 
WOCBP 
Women of childbearing potential 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
2. 
INTRODUCTION 
2.1. 
Summary 
Seborrheic keratosis (SK) is one of the most common skin tumors in man. These benign 
epithelial skin tumors are most commonly seen in older individuals, increasing in 
prevalence with increasing age, and affect men and women roughly equally. While the 
growths may be solitary, they often occur in large numbers and typically present as 
well demarcated, elevated or “stuck-on” appearing papules or plaques that may vary 
from flesh-colored, to shades of yellow, gray, brown, or black.  
 
Though benign, SK lesions are often cosmetically worrisome to patients, must 
sometimes be distinguished from other benign or malignant skin tumors and may 
become pruritic, irritated, bleed, and may be painful when traumatized particularly 
when located in areas prone to friction and trauma such as belt-lines and brassiere-strap 
lines.  
 
Patients often seek treatment of SK for cosmetic reasons, particularly if they are located 
in a highly visible (“cosmetically sensitive”) area such as the face, and especially if they 
are large, pigmented, if multiple lesions are present, or simply because the lesions are 
commonly associated with “old age”. Removal may be medically indicated, however, 
for lesions that become irritated, pruritic, inflamed, or painful, or for lesions that the 
clinician feels require histologic confirmation of the diagnosis. 
  
Numerous treatment options exist, and include a plethora of destructive/ablative 
modalities such as liquid nitrogen cryotherapy, electrodesiccation, lasers of various 
wavelengths (ablative and non-ablative), radio-frequency ablation, and surgical 
removal by curettage or surgical excision. There is, however, a notable lack of well- 
controlled clinical trials comparing the efficacy, complications and complication rates of 
these treatments. There is great variability among practitioners in the methods 
employed using each of these techniques (e.g., variability in contact time and method of 
freezing the lesions with liquid nitrogen) with great variability of the results. None of 
these treatments is, in fact, approved by the Food and Drug Administration (FDA) for 
the treatment of seborrheic keratosis. While these methods can be effective, many 
require specialized training and/or the use of expensive equipment, they are painful 
and may require anesthesia and/or analgesia, and they are often complicated by 
significant adverse outcomes. Both hypopigmentation and hyperpigmentation, which 
may be transient, but are often permanent, are common, as is scarring at the treatment 
site, and the typical post-surgical risks of bleeding and infection increase the risk that 
the result of the treatment of these lesions may be worse than the disease itself. 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
Hydrogen peroxide (H2O2) is a compound that is ubiquitous in the environment. It is 
the simplest peroxide and a potent oxidizing agent commonly used in innumerable 
household goods including chlorine-free bleaches, general-purpose cleaning products, 
and disinfectants. Additionally, H2O2 has been employed as the oxidizing component in 
hair dyes, and has been used in oral hygiene products and tooth-whitening systems for 
many years. In industry, it is employed in the treatment of wastewater. In high 
concentrations, it is used in bleaching paper, pulp, and textiles. Clinically, in addition to 
its use as an oral topical agent noted above, H2O2 is widely employed at low 
concentrations (e.g., 3%-6%) as a wound irrigant and topical antiseptic/disinfectant, and 
has been in use medicinally since its introduction into clinical practice by Richardson in 
1858.  
 
H2O2 is an important oxidizing agent in biological systems. The local deleterious effects 
of reactive oxygen species on the skin are mitigated by the presence of a complex 
antioxidant defense system that includes, enzymes such as catalase, glutathione 
peroxidase, superoxide dismutase, thioredoxin reductase, lipoamine, lipid peroxidase 
and others, as well as non-enzymatic components including ascorbic acid, urates and 
uric acid, tocopherol, glutathione, ubiquinones, ubiquinol and other water soluble 
groups.  The local application of supra-physiologic concentrations of H2O2 may 
overwhelm the antioxidant defense systems in the skin, allowing H2O2 to act not only 
through its direct oxidation of organic tissues, generation of reactive oxygen species, 
and local lipid peroxidation, but also by the generation of local concentrations of O2 that 
are toxic to the abnormal lesional (seborrheic keratosis) cells. 
 
Data from a proof of concept study (A-101-SEBK-201) suggests that the topical 
application of A-101 Solution 40% and 32.5% to SK lesions has the potential to safely 
and effectively resolve SK lesions without the need for analgesia and/or anesthesia, and 
with a minimal risk of hypopigmentation, hyperpigmentation, or scarring. 
 
2.2. 
Study Rationale 
Clinical information from a previous study (A-101-SEBK-201) suggests that A-101 
Solution 40% and 32.5% may safely and effectively resolve SK lesions on the back. A 
second currently ongoing study (A-101-SEBK-202) is evaluating the safety and efficacy 
of A-101 Solution 40% and 32.5% to remove SK lesions on the trunk and extremities. 
The rationale for this study is to evaluate the safety and efficacy of 2 concentrations of 
A-101 Solution (i.e., 40% and 32.5%) and it’s matching A-101 Solution Vehicle when 
applied to SK target lesions on the face. This study is designed to provide data to 
provide an understanding of the safety and efficacy of A-101 Solution for the removal of 
SK lesions on the face.  
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
3. 
STUDY OBJECTIVES 
The main objective of this study is to evaluate the dose-response relationship of 2 
concentrations of A-101 Solution and its matching A-101 Solution Vehicle when applied 
to SK target lesions on the face. A further objective is to evaluate the safety and efficacy 
of 2 concentrations of A-101 Solution and its matching A-101 Solution Vehicle when 
applied topically up to 2 times to SK target lesions on the face. 
 
4. 
SELECTION AND DISPOSITION OF STUDY POPULATION 
4.1. 
Number of Subjects 
Approximately 108 subjects will be randomized in this study with approximately 36 
subjects randomized in each of 3 treatment groups. Subjects will be enrolled at multiple 
US investigational centers and enrollment will be competitive. 
 
4.2. 
Study Population Characteristics 
Male and female subjects, 18 years of age or older, with a clinical diagnosis of SK and 1 
clinically typical SK target lesion on the face, who meet all the inclusion criteria and 
none of the exclusion criteria, will be eligible to enroll in this study.  
 
 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
4.3. 
Inclusion Criteria 
In order to be eligible for the study, subjects must fulfill all of the following criteria: 
1. 
Subject is at least 18 years of age 
2. 
Subject has a Fitzpatrick skin type of 1-4 
3. 
Subject has a clinical diagnosis of stable clinically typical seborrheic 
keratosis 
4. 
Subject has 1 appropriate seborrheic keratosis target lesion, as defined 
below (Section 5.4), on the face: 
 Have a clinically typical appearance    
 Be treatment naïve    
 Have a PLA of ≥2 (Section 6.1.2)    
 Have a longest axis that is ≥7mm and ≤15mm (Section 5.4) 
 Have a longest dimension perpendicular to the longest axis that 
is ≥7mm and ≤15mm (Section 5.4)      
 Have a thickness that is ≤2mm 
 Be a discrete lesion    
 Be, when centered in the area outlined by the provided 3cm 
diameter circular template, the only seborrheic keratosis lesion 
present 
 Not be on the eyelids 
 Not be within 5mm of the orbital rim    
 Not be covered with hair which, in the investigator’s opinion, 
would interfere with the study medication application or the 
study evaluations (NB: the study medication may bleach hair) 
 Not be in an intertriginous fold    
 Not be pedunculated. 
5. 
If the subject is a woman of childbearing potential, she has a negative 
urine pregnancy test and agrees to use an approved effective method of 
birth control (Section 8) for the duration of the study 
6. 
Subject is non-pregnant and non-lactating 
7. 
Subject is in good general health and free of any known disease state or 
physical condition which, in the investigator’s opinion, might impair 
evaluation of the target lesion or which exposes the subject to an 
unacceptable risk by study participation 
8. 
Subject is willing and able to follow all study instructions and to attend all 
study visits 
9. 
Subject is able to comprehend and willing to sign an Informed Consent 
Form (ICF). 
 
 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
4.4. 
Exclusion Criteria 
Any subject who meets one or more of the following criteria will not be included in this 
study:  
1. 
Subject has clinically atypical and/or rapidly growing seborrheic keratosis 
lesions 
2. 
Subject has presence of multiple eruptive seborrheic keratosis lesions 
(Sign of Lesser-Trelat) 
3. 
Subject has a current systemic malignancy  
4. 
Subject has a history of keloid formation or hypertrophic scarring 
5. 
Subject has used any of the following systemic therapies within the specified 
period prior to Visit 1: 
 Retinoids; 180 days 
 Glucocortico-steroids; 28 days 
 Anti-metabolites (e.g., methotrexate); 28 days 
6. 
Subject has used any of the following topical therapies within the specified 
period prior to Visit 1 on, or in a proximity to the target lesion, which in the 
investigator’s opinion, interferes with the application of the study 
medication or the study assessments: 
 LASER, light (e.g., intense pulsed light [IPL], photo-dynamic therapy 
[PDT]) or other energy based therapy; 180 days  
 Retinoids; 28 days 
 Liquid nitrogen, electrodesiccation, curettage, imiquimod, 5-
flurouracil, or ingenol mebutate; 60 days 
 Glucocortico-steroids or antibiotics; 14 days 
7. 
Subject currently has or has had any of the following within the specified 
period prior to Visit 1 on, or in a proximity to the target lesion, which in the 
investigator’s opinion, interferes with the application of the study 
medication or the study assessments : 
 A cutaneous malignancy; 180 days 
 Experienced a sunburn;  28 days 
 A pre-malignancy (e.g., actinic keratosis); currently 
 Body art (e.g., tattoos, piercing,  etc.); currently  
 Excessive tan; currently 
8. 
Subject has a history of sensitivity to any of the ingredients in the study 
medications 
9. 
Subject has any current skin disease (e.g., psoriasis, atopic dermatitis,  
eczema, sun damage, etc.), or condition (e.g., sunburn, excessive hair, open 
wounds) which, in the investigator’s opinion, might put the subject at 
undue risk by study participation or interfere with the study conduct or 
evaluations 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
10. 
Subject has participated in an investigational drug trial in which 
administration of an investigational study medication occurred within 
30 days prior to Visit 1. 
 
4.5. 
Previous and Concomitant Therapies 
4.5.1. 
Previous therapies 
At Visit 1, the investigator or designee will question the subject to ensure they have not 
used any excluded therapies (Section 4.4). 
 
4.5.2. 
Concomitant therapies 
Concomitant therapies are any new or existing therapy received from Visit 1 until 
discharge from the study.  
 
Concomitant therapies include drug (e.g., prescription, over-the-counter [OTC]) and 
non-drug (e.g., chiropractic, physical therapy, energy-based treatments) therapies. 
Subjects will refrain from receipt of any therapy in compliance with the 
inclusion/exclusion criteria. Subjects should refrain from changing the use of any 
concomitant therapies during the study.  
 
All new or modified concomitant therapies used during the study must be recorded. 
 
Any new or modified concomitant therapy must be considered to determine if it is 
related to an AE. An AE must be reported unless the therapy is modified for non-
medical reasons (e.g., health insurance purposes) or it is for prophylaxis (e.g., 
vaccinations). 
 
4.5.3. 
Prohibited therapies 
During the course of this study, subjects are prohibited from using therapies listed in 
the exclusion criteria (Section 4.4). The investigator should notify the Aclaris 
Therapeutics, Inc. Medical Monitor (Section 7.2) immediately if any prohibited therapies 
are required to ensure subject safety. 
 
Starting with Visit 2, subjects must: 
 On study visit days, not apply any topical products (e.g., moisturizers, makeup, 
sunscreens, etc.) to the target lesion within 12 hours prior to any study visit 
(Note: routine cleansing products are allowed) 
 Not apply any topical products to the target lesion for at least 6 hours after any 
study medication application. 
 

Protocol: A-101-SEBK-203 
Aclaris Therapeutics, Inc. 
 
 
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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
Starting 6 days prior to Visit 2, and for the remainder of the study, subjects must not use 
any peroxide containing products on her/his face or head. 
 
4.6. 
Subject Discontinuation from the Study 
Subjects will be informed that they are free to withdraw from the study at any time and 
for any reason.  
 
The investigator may remove a subject from the study if, in the investigator's opinion, it 
is not in the best interest of the subject to continue the study. Examples of other reasons 
subjects may be discontinued from the study are a change in compliance with an 
inclusion or exclusion criterion, occurrence of AEs, occurrence of pregnancy or use of a 
prohibited therapy. Immediately (within 24 hours) notify the Aclaris Therapeutics, Inc. 
study monitor of discontinuation.  
 
In case of premature discontinuation of study participation, efforts will be made to 
perform all final study day assessments. The date the subject is withdrawn from the 
study and the reason for discontinuation will be recorded on the subject’s case report 
forms (CRFs). All withdrawn subjects with ongoing AEs will be followed as appropriate 
(Section 7.2.1). 
 
The study may be discontinued at the discretion of Aclaris Therapeutics, Inc. Some 
examples of reasons for discontinuation are the occurrence of the following: 
 
Increased frequency, severity or duration of known AEs 
 
Medical, regulatory or ethical reasons affecting the continued 
performance of the study 
 
Difficulties in the recruitment of subjects. 
 
4.7. 
Subject Number (SN) 
The investigator will assign a unique four-digit subject number (SN) to each subject at 
Visit 1.  
 
The SN format will be NN-NN where the first two digits are the investigational center 
site number (using leading zeroes as appropriate). The final two digits must be assigned 
in ascending numerical order, without omitting or repeating any number, starting with 
01 at each investigational center. For example, the SN for the second subject that signs 
an informed consent at site number 01 would be 01-02.  
 
The subject will be identified using the SN in all study documentation for the duration 
of the study. 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
4.8. 
Replacement Subjects 
Subject enrollment will continue until approximately 108 subjects have been 
randomized. Subjects who are randomized and do not complete the study will not be 
replaced. 
 
5. 
INVESTIGATIONAL PLAN 
5.1. 
Study Design 
This is a randomized, double-blind, vehicle-controlled, parallel group study of 2 
concentrations of A-101 Solution (i.e., 40% and 32.5%) and its matching A-101 Solution 
Vehicle in subjects with SK. Eligible subjects will have 1 appropriate SK target lesion on 
the face. 
 
The study will be conducted at multiple US study centers. The study visit schedule is: 
 Visit 1 (Day -13 to 0) enrollment; start screening period 
 Visit 2 (Day 1) randomization; study medication application 
 Visit 3 (Day 8) no treatment follow-up 
 Visit 4 (Day 22) follow-up visit where target lesions that meet the retreatment 
criteria will receive a second study medication application 
 Visit 5 (Day 29) no treatment follow-up 
 Visit 6 (Day 50) no treatment follow-up 
 Visit 7 (Day 78) no treatment follow-up 
 Visit 8 (Day 106) no treatment follow-up; end of study. 
 
At Visit 1, the investigator will identify 1 SK target lesion on the face for treatment for 
each subject. Subjects may have more than 1 SK lesion, but only the target lesion will be 
evaluated and treated. The investigator will also collect blood samples for clinical 
laboratory safety tests to determine the subject’s eligibility for randomization.  
 
At Visit 2, the investigator will randomize eligible subjects and perform an initial study 
medication application. 
 
At Visit 3, subjects will be seen for a no treatment follow-up. 
 
At Visit 4, subjects will be seen for follow-up and any target lesion that meets the re-
treatment criteria (e.g., PLA >0) will receive a retreatment study medication application.  
 
At Visits 5 through 7, subjects will be seen for a no treatment follow-up. 
 
At Visit 8, subjects will be seen for a no treatment follow-up and be discharged from the 
study. 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
5.2. 
Study Flow Chart 
Visit 
1 
2 
3 
4 
5 
6 
7 
8 
Protocol 
Section 
Day 
-13 to 0 
1 
8 
22 
29 
50 
78 
106 
Informed consent 
X 
 
 
 
 
 
 
 
11.3 
Subject number 
X 
 
 
 
 
 
 
 
4.7 
Inclusion/exclusion criteria 
X 
 
 
 
 
 
 
 
4.3/4.4 
Demographics & medical 
history 
X 
 
 
 
 
 
 
 
6.3.1 
Vital signs 
X 
X1 
 
 
 
 
 
X 
6.2.2 
Clinical laboratory sampling 
X 
X1 
 
 
 
 
 
X 
6.2.3 
Urine pregnancy tests 
X 
X1 
 
 
 
 
 
X 
6.2.4 
Target lesion identification 
X 
 
 
 
 
 
 
 
5.4 
Subject’s self-assessment 
 
X1 
 
 
 
 
 
X 
6.1.1 
Physician’s lesion assessment 
X 
X1 
 
X1 
 
X 
X 
X 
6.1.2 
Lesion dimensions 
X 
X1 
 
X1 
 
 
 
X 
6.1.3 
Local skin reactions 
 
X2 
X 
X2 
X 
X 
X 
X 
6.2.1 
Standardized photography  
(at 1 selected center only) 
X 
X1 
 
X1 
 
 
 
X 
6.3.2 
Subject randomization 
 
X1 
 
 
 
 
 
 
5.7.4 
Study medication application 
 
X 
 
X3 
 
 
 
 
5.7.6 
Subject instructions 
X 
X 
X 
X 
X 
X 
X 
X 
5.6 
Concomitant therapies 
X 
X 
X 
X 
X 
X 
X 
X 
4.5.2 
Adverse events 
X 
X 
X 
X 
X 
X 
X 
X 
7 
1 Performed prior to the study medication application 
2 Performed prior to and after the study medication application 
3 Only for Target Lesions that meet the retreatment criteria. 
 
 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
5.3. 
Study Visits Description and Procedures 
A written, signed informed consent form (ICF) must be obtained from each subject prior 
to performing any study related procedure (i.e., prior to vital signs, clinical laboratory 
sampling, urine pregnancy test or photography). 
 
5.3.1. 
Visit 1 (Day -13 to 0)  
At this visit, the investigator or designee will: 
1. Review and explain the nature of the study to the subject, obtain the subject’s 
signature on the appropriate approved ICF and Health Insurance Portability and 
Accountability Act (HIPAA) authorization and provide a signed and dated copy 
to the subject (Section 11.3) 
2. Assign a SN to the subject (Section 4.7) 
3. Confirm the subject meets all inclusion criteria and no exclusion criteria (Section 
4.3 and 4.4 respectively) 
4. Collect demographic and medical history information (Section 6.3.1) 
5. The investigator will determine the subject’s Fitzpatrick skin type (Section 6.3.1) 
6. Collect concomitant therapies information (Section 4.5.2) 
7. Measure vital signs (Section 6.2.2) 
8. Collect blood samples for clinical laboratory tests (Section 6.2.3) 
9. Perform a urine pregnancy test for women of childbearing potential (WOCBP); 
results must be negative for the subject to continue in the study (Section 6.2.4) 
10. Identify 1 appropriate seborrheic keratosis target lesion on the subject’s face 
(Section 5.4) 
11. Perform a PLA for the target lesion; a PLA grade of ≥2 is required for the target 
lesion for the subject to continue in the study (Section 6.1.2) 
12. Measure the dimensions of the target lesion; the longest axis of the target lesion 
must be ≥7mm and ≤15mm and the longest dimension perpendicular to the 
longest axis must be ≥7mm and ≤15mm (Section 5.4) 
13. AT ONE SELECTED CENTER ONLY take standardized color photographs of the 
target lesion (Section 6.3.2) 
14. Review the study instructions and restrictions with the subject (Section 5.5) 
15. Instruct the subject not to apply any topical products (e.g., moisturizers, makeup, 
sunscreens, etc.), except routine cleansing products, to the target lesion within 12 
hours prior to Visit 2 (Section 4.5.3) 
16. Instruct the subject not to use any peroxide containing products on her/his face 
or head from at least 6 days prior to Visit 2 and for the remainder of the study 
(Section 4.5.3) 
17. Dispense a Subject Instruction Sheet (Section 12) 
18. Schedule Visit 2 within 14 days. 
 
 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
5.3.2. 
Visit 2 (Day 1)  
This visit must occur within 14 days after Visit 1.  
 
Subsequent study visit dates must be scheduled based on the date of Visit 2. 
 
This visit may not occur before the investigator reviews the Visit 1 clinical laboratory 
test results. For the subject to continue in the study all required clinical laboratory test 
results must be within the range of normal for the laboratory or, if there are any 
abnormal results, they must be defined as not clinically relevant (NCR) by the 
investigator (Section 6.2.3). 
 
At this visit, the investigator or designee will perform the following procedures PRIOR 
TO RANDOMIZATION: 
1. Query the subject in a non-directive manner about any changes in her/his health 
since the previous visit and report all AEs on the appropriate form (Section 7.2.1) 
2. Query the subject about any changes in her/his concomitant therapies since the 
previous visit and report changes on the appropriate form (Section 4.5.2) 
3. Confirm the subject continues to comply with all study restrictions, is eligible to 
continue in the study and has followed all study instructions (Section 5.5) 
4. Confirm the subject did not use any prohibited therapies (Section 4.5.3) 
5. Measure vital signs (Section 6.2.2) 
6. Collect concomitant therapies information (Section 4.5.2) 
7. Collect blood samples for clinical laboratory tests (Section 6.2.3) 
8. Perform a urine pregnancy test for women of childbearing potential (WOCBP); 
results must be negative for the subject to be randomized (Section 6.2.4) 
9. Confirm the location of the target lesion (Section 5.4) 
10. AT ONE SELECTED CENTER ONLY take standardized color photographs of the 
target lesion (Section 6.3.2) 
11. Have the subject perform an SSA for the target lesion (Section 6.1.1) 
12. Have the subject perform a pre-application Local Skin Reaction assessment of the 
symptoms for the target lesion (Section 6.2.1) 
13. ONLY AFTER THE SUBJECT COMPLETES THE SSA perform a PLA for the 
target lesion; a PLA grade of ≥2 is required for the target lesion for the subject to 
be randomized (Section 6.1.2) 
14. Perform a pre-application Local Skin Reaction assessment of the signs for the 
target lesion (Section 6.2.1) 
15. Measure the dimensions of the target lesion; for the target lesion the longest axis 
must be ≥7mm and ≤15mm and the longest dimension perpendicular to the 
longest axis must be ≥7mm and ≤15mm (Section 5.4) 
16. Confirm subject is eligible for randomization (Section 5.7.4) 
17. Discharge from the study subjects who are not eligible for randomization 
(Section 4.6).  
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
For subjects eligible for randomization the investigator or designee will perform the 
following procedures:  
1. Randomize eligible subjects (Section 5.7.4) 
2. Perform the initial study medication application for the target lesion (Section 
5.7.6) 
3. Monitor the subject for at least 20 minutes after the Application Completion Time 
to detect any adverse events (Section 7.2.1) 
4. Have the subject perform a post-application Local Skin Reaction assessment of 
the symptoms for the target lesion 10 (±4) minutes after the Application 
Completion Time (Section 6.2.1) 
5. Perform a post-application Local Skin Reaction assessment of the signs for the 
target lesion 20 (±4) minutes after the Application Completion Time (Section 
6.2.1) 
6. Review the study instructions and restrictions with the subject (Section 5.5) 
7. Schedule Visit 3 for Day 8. 
 
5.3.3. 
Visit 3 (Day 8)  
This visit must occur 7 days (±4 days) after Visit 2. 
 
At this visit, the investigator or designee will perform the following procedures: 
1. Query the subject in a non-directive manner about any changes in her/his health 
since the previous visit and report all AEs on the appropriate form (Section 7.2.1) 
2. Query the subject about any changes in her/his concomitant therapies since the 
previous visit and report changes on the appropriate form (Section 4.5.2) 
3. Confirm the subject continues to comply with all study restrictions, is eligible to 
continue in the study and has followed all study instructions (Section 5.5) 
4. Confirm the location of the target lesion (Section 5.4) 
5. Have the subject perform a Local Skin Reaction assessment for each of the 
symptoms for the target lesion (Section 6.2.1) 
6. Perform an Local Skin Reaction assessment of the signs for the target lesion 
(Section 6.2.1) 
7. Review the study instructions and restrictions with the subject (Section 5.5) 
8. Schedule Visit 4 for Day 22. 
 
 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
5.3.4. 
Visit 4 (Day 22)  
This visit must occur 21 days (±4 days) after Visit 2. 
 
At this visit, the investigator or designee will perform the following procedures PRIOR 
TO ANY RETREATMENT STUDY MEDICATION APPLICATION: 
1. Query the subject in a non-directive manner about any changes in her/his health 
since the previous visit and report all AEs on the appropriate form (Section 7.2.1) 
2. Query the subject about any changes in her/his concomitant therapies since the 
previous visit and report changes on the appropriate form (Section 4.5.2) 
3. Confirm the subject continues to comply with all study restrictions and has 
followed all study instructions (Section 5.5) 
4. Confirm the location of the target lesion (Section 5.4) 
5. AT ONE SELECTED CENTER ONLY take standardized color photographs of the 
target lesion (Section 6.3.2) 
6. Have the subject perform a Local Skin Reaction assessment of the symptoms for 
the target lesion (Section 6.2.1) 
7. Perform a PLA for the target lesion (Section 6.1.2) 
8. Perform a Local Skin Reaction assessment of the signs for the target lesion 
(Section 6.2.1) 
9. Measure the dimensions of the target lesion (Section 6.1.3) 
10. Determine if the target lesion requires a retreatment study medication 
application (Section 5.7.6). 
 
ONLY for subjects who have a target lesion that requires a retreatment study 
medication application (i.e., PLA>0), the investigator or designee will perform the 
following procedures:  
1. Perform a retreatment study medication application for the target lesion (Section 
5.7.6) 
2. Monitor the subject for at least 20 minutes after the Application Completion Time 
to detect any adverse events (Section 7.2.1) 
3. Have the subject perform a post-application Local Skin Reaction assessment of 
the symptoms for the target lesion that was retreated 10 (±4) minutes after the 
Application Completion Time (Section 6.2.1) 
4. Perform a post-application Local Skin Reaction assessment of the signs for the 
target lesion that was retreated 20 (±4) minutes after the Application Completion 
Time (Section 6.2.1) 
 
For all subjects the investigator or designee will perform the following procedures: 
1. Review the study instructions and restrictions with the subject (Section 5.5) 
2. Schedule Visit 5 for Day 29. 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
5.3.5. 
Visits 5 (Days 29) 
This visit must occur 28 days (±4 days) after Visit. 
 
At this visit, the investigator or designee will perform the following procedures: 
1. Query the subject in a non-directive manner about any changes in her/his health 
since the previous visit and report all AEs on the appropriate form (Section 7.2.1) 
2. Query the subject about any changes in her/his concomitant therapies since the 
previous visit and report changes on the appropriate form (Section 4.5.2) 
3. Confirm the subject continues to comply with all study restrictions and has 
followed all study instructions (Section 5.5) 
4. Confirm the location of the target lesion (Section 5.4) 
5. Have the subject perform a Local Skin Reaction assessment of the symptoms for 
the target lesion (Section 6.2.1) 
6. Perform a Local Skin Reaction assessment of the signs for the target lesion 
(Section 6.2.1) 
7. Review the study instructions and restrictions with the subject (Section 5.5) 
8. Schedule Visit 6 for Day 50. 
 
5.3.6. 
Visits 6 and 7 (Days 50 and 78) 
These visits must occur within the following visit window after Visit 2: 
 Visit 6, 49 days (±4 days) 
Visit 7, 77 days (±4 days).  
 
At these visits, the investigator or designee will perform the following procedures: 
1. Query the subject in a non-directive manner about any changes in her/his health 
since the previous visit and report all AEs on the appropriate form (Section 7.2.1) 
2. Query the subject about any changes in her/his concomitant therapies since the 
previous visit and report changes on the appropriate form (Section 4.5.2) 
3. Confirm the subject continues to comply with all study restrictions and has 
followed all study instructions (Section 5.5) 
4. Confirm the location of the target lesion (Section 5.4) 
5. Have the subject perform a Local Skin Reaction assessment of the symptoms for 
the target lesion (Section 6.2.1) 
6. Perform a PLA for the target lesion (Section 6.1.2) 
7. Perform a Local Skin Reaction assessment of the signs for the target lesion 
(Section 6.2.1) 
8. Review the study instructions and restrictions with the subject (Section 5.5) 
9. Schedule the next study visit as appropriate. 
 
 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
5.3.7. 
Visit 8 (Day 106) 
This visit must occur 105 days (±4 days) after Visit 2. 
 
At this visit, the investigator or designee will perform the following procedures: 
1. Query the subject in a non-directive manner about any changes in her/his health 
since the previous visit and report all AEs on the appropriate form (Section 7.2.1) 
2. Query the subject about any changes in her/his concomitant therapies since the 
previous visit and report changes on the appropriate form (Section 4.5.2) 
3. Confirm the subject continues to comply with all study restrictions and has 
followed all study instructions (Section 5.5) 
4. Measure vital signs (Section 6.2.2) 
5. Collect blood samples for clinical laboratory tests (Section 6.2.3) 
6. Perform a urine pregnancy test for WOCBP (Section 6.2.4) 
7. Confirm the location of the target lesion (Section 5.4) 
8. AT ONE SELECTED CENTER ONLY take standardized color photographs of the 
target lesion (Section 6.3.2) 
9. Have the subject perform an SSA for the target lesion (Section 6.1.1) 
10. Have the subject perform a Local Skin Reaction assessment of the symptoms for 
the target lesion (Section 6.2.1) 
11. ONLY AFTER THE SUBJECT COMPLETES THE SSA perform PLA for the target 
lesion (Section 6.1.2) 
12. Perform a Local Skin Reaction assessment of the signs for the target lesion 
(Section 6.2.1) 
13. Measure the dimensions of the target lesion (Section 6.1.3) 
14. Discharge the subject from the study. 
 
5.4. 
Target Lesion Identification 
At Visit 1, the investigator will identify 1 target lesion on the face for treatment and 
evaluation. 
 
For this study, the face is defined vertically from the mandibular ridge to the hairline 
(for subjects with a receding hairline the hairline is defined by the vertical line drawn 
from tragus to tragus) and horizontally from tragus to tragus, excluding the eyelids and 
areas within 5mm of the orbital rim.  
 
 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
At Visit 1, the target lesion must: 
 Have a clinically typical appearance    
 Be treatment naïve    
 Have a PLA of ≥2 (Section 6.1.2)    
 Have a longest axis that is ≥7mm and ≤15mm (Section 5.4) 
 Have a longest dimension perpendicular to the longest axis that is ≥7mm and 
≤15mm (Section 5.4) 
 Have a thickness that is ≤2mm      
 Be a discrete lesion    
 Be, when centered in the area outlined by the provided 3cm diameter circular 
template, the only visible seborrheic keratosis lesion    
 Not be on the eyelids 
 Not be within 5mm of the orbital rim 
 Not be covered with hair which, in the investigator’s opinion, would interfere 
with the study medication application or the study evaluations (NB: the study 
medication may bleach hair) 
 Not be in an intertriginous fold    
 Not be pedunculated. 
 
Record the location of the target lesion on the face chart in the CRFs indicating 
landmarks and distances to assist with identifying the target lesion at subsequent visits. 
 
At Visit 1, the investigator and an investigational staff member will identify the target 
lesion by placing 2 white identification (ID) stickers approximately 180 degrees opposite 
each other with the target lesion in the center of the area outlined by the provided 
circular template (diagram not to scale): 
               
                                                         
                                                              ID Sticker 
                                                                                          
 
 
 
 
                                                                                                                               3cm diameter cutout  
                               Target Lesion                                                            
  
 
 
 
 
 
                                                                       
 
                                                                       
                                                                                      ID Sticker 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
  
To help confirm the target lesion location at subsequent visits place one ID sticker above 
the target lesion and write an “x” on the sticker, place a second ID sticker below the 
target lesion. 
 
At the selected investigational center where standardized photographs are taken, the 
identification stickers must be visible in the study photographs (Section 6.3.2).  
 
At Visits 2-8, an investigational staff member other than the investigator, will confirm 
the location of the target lesion using an appropriate combination of the Visit 1 
photographs and the face chart.  
 
5.5. 
Subject Instructions 
An investigational center staff member will dispense a Subject Instruction Sheet to each 
subject at Visit 1 (Section 12). 
 
Throughout the study, the subjects should: 
 Continue their routine cleansing regimen except they should avoid vigorous 
scrubbing of the target lesion (e.g., abrasive cleansing pads, abrasive cleansers, 
etc.) 
 Continue their routine cosmetics and skin care products 
 Avoid exposing the target lesion to excessive natural or artificial ultraviolet 
radiation (e.g., sunlight, tanning beds) and use sunscreen on the target lesion, if 
excessive exposure cannot be avoided 
 Avoid or modify activities (e.g., shaving, massages, etc.) that might irritate the 
target lesion 
 Bring the subject instruction sheet with them to each visit. 
 
Starting with Visit 2, subjects must: 
 On study visit days, not apply any topical products (e.g., moisturizers, makeup, 
sunscreens, etc.) to the target lesion within 12 hours prior to any study visit 
(Note: routine cleansing products are allowed) 
 Not apply any topical products to the target lesion for at least 6 hours after any 
study medication application. 
 
Starting 6 days prior to Visit 2, and for the remainder of the study, subjects must not use 
any peroxide containing products on her/his face or head. 
 
After the completion of any study visit where a study medication application was 
performed DO NOT: 
 Wash/submerge the target lesion for at least 6 hours 
 Apply any topical products to the target lesions for at least 6 hours. 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
 
5.6. 
STUDY DURATION 
The duration of study participation is anticipated to be a maximum of 124 days per 
subject. This includes the up to 14 day screening period, a visit for the required first 
study medication application, a visit 21 days later for an optional retreatment study 
medication application and an 84-day no treatment follow-up period. The final study 
visit (Visit 8) has a maximum allowable visit window of 4 days.   
 
The total study duration is anticipated to be approximately 166 days from the first 
subject’s first visit to the last subject’s last visit.   
 
The study end date is the date of the last subject’s last visit.  
 
5.7. 
STUDY MEDICATIONS 
5.7.1. 
Study medication identity 
The study medications are water-clear, colorless solutions that are indistinguishable in 
physical appearance. The study medications must be stored in a secure area with 
limited access under appropriately controlled and monitored storage conditions. 
 
Study Medication Information 
Study medication 
name 
A-101 Solution 
40% 
A-101 Solution 
32.5% 
A-101 Solution 
Vehicle 
Manufacturer 
Pharmaceutical Manufacturing and Research Services, 
Horsham, PA, US 
A-101 concentration 
(%) 
40 
32.5 
0 
Pharmaceutical Form 
Solution 
Storage Conditions 
68°F to 77°F (20°C to 25°C) protected from light, excessive heat, 
open flame and combustibles, out of direct sunlight and in a 
well-ventilated, dry area 
Dose regimen 
 
Route 
Topical 
Frequency 
1 application to the target lesion at Visit 2;  
a potential retreatment application to the target lesion at Visit 4 
Duration of 
administration 
Up to 2 applications to the target lesion 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
5.7.2. 
Study medication packaging and labeling 
The study medications will be packaged in identical appearing, single-use, 2-dram 
(~7.4mL) amber glass, screw-top vials that each contains approximately 3mL of study 
medication. 
 
One Subject Kit that contains 3 vials of study medication will be provided to each 
investigational center for each subject. Subject Kits will be labeled with a two-part, 
three-panel, double-blind label. One part (one-panel) of the label remains attached to 
the Subject Kit, the other part (two-panel tear-off) is separated and attached to the 
subject’s Label Page CRF when the subject is randomized (Section 5.7.4). 
 
The affixed part and the first panel of the tear-off part of the Subject Kit label show at 
least the following: 
 Subject Kit number (randomization number) 
 Protocol number 
 Storage conditions 
 Sponsor information 
 Investigational drug warning 
 Space to enter SN 
 Space to enter the subject’s initials 
 Space to enter the date of randomization. 
 
Each study medication vial will be labeled with a one-part label that remains attached 
to the vial and show at least the following: 
 Subject Kit number (randomization number) 
 Protocol number 
 Vial number 
 Investigational drug warning 
 Space to enter SN 
 Space to enter the date of application. 
 
5.7.3. 
Method of treatment assignment 
Prior to the start of the study, Aclaris Therapeutics, Inc. or a designated third party will 
generate a list of randomization numbers that shall be transmitted to the assigned 
clinical packaging organization for study medication labeling. 
 
The randomization list will be stored with access limited to designated personnel for 
study medication labeling. The randomization list will be made available as appropriate 
to un-blind the database. 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
5.7.4. 
Subject randomization 
At Visit 2, an investigational center staff member will assign study medication to 
eligible subjects by selecting an appropriate Subject Kit. The staff member must select 
Subject Kits in chronological sequence and in ascending numerical order starting with 
the lowest available Subject Kit number.  
 
No Subject Kit number may be omitted or reused. The Subject Kit number is the 
randomization number. 
 
The sequence of study medication assignments will be assigned in a random manner in 
a 1:1:1 ratio. 
 
The investigational center staff member randomizing the subject will enter the SN, 
subject initials and date randomized on both parts of the Subject Kit label, remove the 
tear-off part, attach it to the subject’s Label Page CRF and record the Subject Kit number 
in the subject’s CRF.  
 
5.7.5. 
Dispensing study medication 
The study medications must be applied only to study subjects, only at the 
investigational center and only by authorized personnel as required by applicable 
regulations, guidelines and protocol. 
 
At Visit 2, after a subject is randomized (Section 5.7.4), locate the appropriate Subject Kit 
and the study medication vial with the lowest vial number. Enter the SN and date of 
application on the vial label. 
 
At Visit 4, perform a retreatment application if the target lesion meets the retreatment 
criteria (Section 5.7.6). Locate the appropriate Subject Kit and the unused study 
medication vial with the lowest number and enter the SN and date of application on the 
vial label. Use a different vial from the vial used for the Visit 2 applications. 
 
 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
5.7.6. 
Study medication application 
The study medications are for external, topical use on the target lesions on the 
appropriate study subject only.  
 
The investigational center staff member performing the study medication applications 
must comply with the study medication handling warnings (Section 5.7.1) 
 
At Visit 2, the staff member will perform an initial study medication application for the 
target lesion.  
 
At Visit 4, if the target lesion has a PLA grade of >0 it must receive a retreatment study 
medication application UNLESS either of the following criteria apply to the target 
lesion: 
 The target lesion has a Visit 4 pre-application LSR grade of 3 (severe) for any 
sign or symptom AND the grade has increased compared to the Visit 3 grade 
 The target lesion is, in the investigator’s opinion, not appropriate for a 
retreatment (the investigator must note the reason on the subject’s Comments 
CRF page). 
 
The Visit 4 retreatment applications will be terminated for all subjects in the study if 3 
or more subjects in a treatment group discontinue from the study due to study 
medication related AEs. The Aclaris Therapeutics Medical Monitor will inform each 
investigator if this situation occurs. 
 
To perform a study medication application for a target lesion the staff member will 
select the appropriate vial of study medication (Section 5.7.5) then follow these 
application instructions: 
 Wash her/his hands prior to, and after completing the study medication 
applications  
 Wear latex, nitrile or vinyl examination gloves during the application 
 DO NOT EVER pass the study medication vial or any study medication 
applicator over the subject’s body or face even if the vial is closed and the 
applicator is dry. 
 Do not apply the study medications to eyes, mouth, mucous membranes, open 
wounds 
 Do not apply the study medication to the eyelids or within 5 mm of the orbital 
rim 
 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
 If, in the investigators opinion it is needed to ensure no study medication enters 
the eye: 
o Position the subject in the supine position with the head slightly elevated 
and angled such that any excess study medication will flow away from 
the eye. 
o Apply white petrolatum (100%) United States Pharmacopeia (USP) along 
the orbital rim and at the medial and lateral canthi; gently stretch the 
periorbital skin between the thumb and forefinger at the time of 
petrolatum application to distend any periorbital rhytides (e.g., “crow’s 
feet”) and ensure full coverage of the skin at the base of the rhytides to 
decrease the likelihood of tracking of the study medication towards the 
eye 
o Have the subject hold an absorbent pad in the appropriate area of the eye 
to absorb any excess study medication that might track away from the 
target lesion 
o Instruct the subject to keep both eyes closed during the entire study 
medication application procedure 
 After the subject is properly prepared and positioned, thoroughly cleanse the 
target lesion by firmly rubbing with a cotton-tipped swab or absorbent wipe 
wetted with 70% isopropyl alcohol 
 Hold the study medication vial away from her/his face and from the subject’s 
face when opening and at all times 
 Using the supplied applicator: 
o Wet the applicator with a quantity of study medication sufficient to wet 
the target lesion with a thin film 
o Using firm pressure and an application technique that is appropriate for 
the target lesion size (e.g., dab and roll the applicator on smaller lesions; 
rub using a circular motion on larger lesions) apply the study medication 
to the target lesion for approximately 20-30 seconds  
o Minimize exposure to the surrounding normal skin and sensitive areas; 
you may have the subject assist by holding absorbent material (e.g., clean 
absorbent wipe, clean paper towel, etc.) to prevent the study medication 
from migrating from the target lesion 
o During the application process remove excess study medication from the 
surrounding skin using a clean absorbent wipe 
o Ensure the target lesion is wet with study medication at the end of the 
20-30 seconds  
o Allow the target lesion to remain undisturbed for approximately 60 
seconds 
o After approximately 60 seconds repeat the application process 
o Repeat the application/waiting cycle until the study medication has been 
applied to the target lesion 4 times. 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
Record the time the final application to the target lesion is completed as the Application 
Completion Time.  
 
After completing the study medication application to the target lesion do not disturb 
the target lesions until just prior to the subject’s post-application LSR evaluation 
(Section 6.2.1).  Just prior to the subject’s post-application LSR evaluation (Section 6.2.1) 
absorb any remaining study medication, dry the target lesion without wiping or 
rubbing and after the target lesion and surrounding area are confirmed to be dry, 
remove, by gently wiping, any white petrolatum that may remain. 
 
An eyewash kit is provided to use in the event that study medication comes in contact 
with a subject’s eye. Follow the instructions on the eyewash kit to cleanse both of the 
subject’s eyes. If you use the eyewash kit the event must be reported as an adverse 
event of “eye irritation” (Section 7.1.1). 
 
5.7.7. 
Dose compliance record 
At every study visit where a study medication application is performed, an 
investigational center staff member will document the study medication usage in the 
CRF. 
 
5.7.8. 
Dose modification 
Study medication applications will be performed at Visit 2, and if appropriate Visit 4, 
by the investigator or an investigational center staff member at the direction of the 
investigator. No study medication will be dispensed to the study subjects. 
 
If any subject refuses to allow the initial study medication treatment or a retreatment 
application, the investigator must report the visit number, visit date and the reason for 
the refusal on the subject’s Comments CRF page.  
 
If the subject’s refusal is associated with an AE, the investigator must report the event 
on the appropriate CRF (Section 7.2).  
 
The subject must have the initial study medication application to the target lesion to 
remain in the study.  
 
The subject does not need to be removed from the study based solely on her/his refusal 
to have a study medication retreatment application on the target lesion.  
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
5.8. 
Study medication Management 
5.8.1. 
Accountability 
The investigator or designee will maintain an accurate record of the receipt of the study 
medications as shipped by Aclaris Therapeutics, Inc. (or designee), including the date 
received and the condition of the study medications. One copy of this receipt will be 
returned to Aclaris Therapeutics, Inc. (or designee) when the contents of the study 
medication shipment have been verified and one copy maintained in the study file. In 
addition, an accurate study medication disposition record will be kept, specifying the 
amount dispensed for each subject and the date of dispensing. This inventory record 
will be available for inspection at any time. At the completion of the study, the original 
inventory record will be available for review by Aclaris Therapeutics, Inc. upon request. 
 
5.8.2. 
Return and disposition of study supplies 
At the completion of the study, all used and unused study medication vials will be 
returned to Aclaris Therapeutics, Inc. (or designee) for disposal per Aclaris 
Therapeutics, Inc. (or designee’s) written instructions. 
 
5.9. 
Other Study Supplies 
Aclaris Therapeutics, Inc. will provide: 
 Handheld mirrors  to assist the subject with the SSA 
 An appropriate ruler, or other instrument, for measuring the lesion dimensions 
 70% isopropyl alcohol for cleansing the SK target lesions during the study 
medication application process 
 White Petrolatum USP for protecting sensitive areas during the study medication 
application 
 Templates for identifying target lesions 
 Supplies and instructions for collecting, labeling, shipping and result reporting 
for the clinical laboratory tests and urine pregnancy tests from a third party 
 For one selected investigational center only, equipment, supplies and training for 
taking standardized photographs from a third party 
 Eyewash kits. 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
5.10. 
Blinding 
5.10.1. 
Verification of blinding 
Blinding of the study medications is important for validity of this study. This study uses 
a double-blind design. The study medications are indistinguishable in appearance, 
packaging and labeling. 
 
5.10.2. 
Un-blinding during the study medication 
Blinding is important for validity of this clinical study. However, the blind may be 
broken in the event of a medical emergency, in which knowledge of the study 
medication identity is critical to the management of the subject’s course of treatment. 
Before breaking the blind the investigator should determine that the information is 
necessary (i.e., that it will alter the subject’s immediate course of treatment). In many 
cases, particularly when the emergency is clearly not study medication-related, the 
problem may be effectively managed by assuming that the subject is receiving an active 
study medication without the need for un-blinding.  
 
If deemed necessary to break the blind for a study subject, attempt to contact the Aclaris 
Therapeutics, Inc. Medical Monitor (protocol page 1 and Section 7.2.2) to obtain 
concurrence. If it is not possible to contact the Medical Monitor beforehand, contact 
her/him as soon as possible after breaking the blind for a subject. 
 
To identify a subject’s study medication, locate the second panel of the tear-off label 
attached to the subject’s Label Page CRF and follow the instructions on the label. Record 
the date of un-blinding, the reason for un-blinding and the initials of the investigational 
center staff member who performed the un-blinding on the subject’s Label Page CRF.  
 
Any subject whose blind has been broken must be discharged from the study (Section 
4.6).  
 
At the end of the study, the original Label Page CRFs will be returned to Aclaris 
Therapeutics with a photocopy placed in the investigator’s study file. The original Label 
Page CRFs will be available, upon request, to the site if needed to respond to a 
regulatory audit. 
 
Any event that requires the use of an eyewash kit the investigator is required to 
break the blind for the subject and take appropriate action (Section 7.1.1).  

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
6. 
STUDY ASSESSMENTS 
The investigator, a designated and appropriately trained staff member or the subject, 
will perform the study assessments according to the schedules noted below.  
 
The same staff member should perform the assessments for a given subject throughout 
the study. If this becomes impossible, an appropriate designee with overlapping 
experience with the subject and study should perform the assessments.  
 
The same lighting conditions and subject positioning should be used for all evaluations 
for a given subject. 
 
6.1. 
Effectiveness Evaluations 
6.1.1. 
Subject’s Self-Assessment (SSA) 
The SSA is the subject’s assessment of the average overall severity of the target lesion at a 
particular time point and is not a comparison with the SSA at any other time point. The 
subject should NOT refer to any other evaluation to assist with these assessments.  
 
At Visits 2 and 8, each subject will assess the target lesion using the scale below and report 
the one integer that best describes the average overall severity of the target lesion. At Visit 
2, the subject must complete the SSA prior to the study medication application and 
prior to the PLA assessment. At Visit 8, the subject must complete the SSA prior to the 
PLA assessment. 
 
An investigational center staff member other than the investigator must educate the 
subject on the SSA scale before each evaluation. 
 
Subjects must be provided with a handheld mirror and/or a wall mirror (i.e., a mirror that 
provides an unobstructed view of the target lesion).  
 
To evaluate the target lesions an investigational staff member other than the investigator 
will identify the target lesion to the subject and direct the subject to assess the lesion. The 
staff member must not influence the subject’s assessment. 
 
Subject’s Self-Assessment 
Grade 
Descriptor 
0 
None: no visible seborrheic keratosis lesion 
1 
Mild: a slightly raised, light brown seborrheic keratosis lesion 
2 
Moderate: an obvious raised, brown seborrheic keratosis lesion 
3 
Severe: a prominent rough, dark seborrheic keratosis lesion 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
The study staff member will report the SSA grade the subject indicates in the source 
document. Both the subject and the study staff member must sign/initial the source 
document to indicate the subject performed the SSA as instructed. 
 
The subject and the investigator must not discuss the subject’s SSA grade and the subject 
must complete the assessment before the investigator performs the PLA (Section 6.1.2). 
 
6.1.2. 
Physician’s Lesion Assessment (PLA) 
The PLA is the investigator’s assessment of the average overall severity of the target 
lesion at a particular time point. The investigator should NOT refer to any other 
assessments to assist with these assessments.  
 
At Visits 1, 2, 4, 6, 7 and 8, the investigator will assess the target lesion using the scale 
below and report the one integer that best describes the average overall severity of the 
target lesion. At Visit 2, and if appropriate Visit 4, the investigator must complete the 
PLA prior to the study medication application. 
 
Physician’s Lesion Assessment 
Grade Descriptor 
0 
Clear: no visible seborrheic keratosis lesion 
1 
Near Clear: a visible seborrheic keratosis lesion with a surface appearance 
different from the surrounding skin (not elevated) 
2 
Thin: a visible seborrheic keratosis lesion (thickness ≤1mm) 
3 
Thick: a visible seborrheic keratosis lesion (thickness >1mm) 
 
At Visit 1 for the subject to be enrolled and at Visit 2 for the subject to be randomized the 
target lesion must have a PLA grade ≥ 2. 
 
At Visits 2 and 8, the subject must complete the SSA (Section 6.1.1) assessment prior to 
the investigator performing the PLA. 
 
 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
6.1.3. 
Lesion Dimensions 
At Visit 1, at Visit 2 prior to randomization, at Visit 4 prior to any retreatment study 
medication application and at Visit 8 the investigator will measure the length, the width 
and, at Visit 1 ONLY, the thickness (height) of the target lesion using the ruler 
provided, or an equivalent.  
 
The investigator must measure the length and width of the target lesion as follows: 
 Length (i.e., the length of the longest axis) measured in millimeters (mm) and 
reported to the nearest mm 
 Width (i.e., the length of the longest axis perpendicular to the length) measured 
in millimeters (mm) and reported to the nearest mm. 
 
At Visit 1 for the subject to be enrolled and at Visit 2 for the subject to be randomized the 
target lesion must have: 
 A length (longest axis) that is ≥7mm and ≤15mm 
 A width (longest dimension perpendicular to the longest axis) that is ≥7mm and 
≤15mm. 
 
At Visit 2, and Visit 4, the length and width must be measured prior to any study 
medication application. 
 
At Visit 1 ONLY, the investigator must measure the thickness (height) of the target 
lesion above the surrounding skin, in mm reported to the nearest 0.5mm. 
 
At Visit 1 for the subject to be enrolled, the target lesion must have a thickness that is 
≤2.0mm.  
 
6.2. 
Safety Evaluations 
In addition to reporting adverse events throughout the study the investigator, a 
designated and appropriately trained staff member or the subject, will perform study 
following safety assessments according to the schedules noted below. 
 
 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
6.2.1. 
Local Skin Reactions (LSR) 
The LSR assessment is the investigator’s assessment of the signs and the subject’s 
assessment of the symptoms associated with irritation at the target lesion site (i.e., the 
target lesion and the skin immediately surrounding the target lesion exposed to study 
medication). The investigator and subject must NOT refer to any other evaluation to assist 
with these assessments. This is not a comparison with the assessment at any other time 
point.  
 
Local Skin Reactions: 
 Signs (assessed by the investigator): 
o Erythema 
o Edema 
o Scaling/dryness 
o Vesicles/bullae 
o Crusting 
o Erosion 
o Ulceration 
o Post-inflammatory hyper-pigmentation 
o Post-inflammatory hypo-pigmentation (does not include the superficial 
transient skin blanching/whitening related to the action of the study 
medications) 
o Atrophy 
o Scarring. 
 
 Symptoms (assessed by the subject): 
o Stinging/burning 
o Pruritus (itch). 
 
At Visits 2-8, the investigator and the subject will evaluate the LSR signs and the LSR 
symptoms at the target lesion site respectively.  
 
The investigator will assess the LSR signs for the target lesion site as follows: 
 Visits 2 and 4: 
o Report the average severity for all signs prior to any study medication 
application 
o For the treated target lesion 20 (±4) minutes after the Application 
Completion Time, report the average severity for the following signs: 
 Erythema 
 Edema 
 Scaling/dryness 
 Vesicles/bullae. 
 Visits 3 and 5-8: 
o Report the average severity for all signs. 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
The subject will assess the LSR symptoms for the target lesion site as follows: 
 Visits 2 and 4: 
o Report the average severity over the previous 24 hours for all symptoms 
prior to any study medication application 
o For the treated target lesion, 10 (±4) minutes after the Application 
Completion Time, report the average severity of the LSR for all symptoms 
since completion of the study medication applications. 
 Visits 3 and 5-8: 
o Report the average severity over the previous 24 hours for all symptoms. 
 
The investigator should report the one integer that best describes average overall 
severity of each LSR sign for the target lesion site using the scale below.  
 
An investigational staff member will identify the target lesion site being evaluated to the 
subject, educate the subject on the LSR scale before each evaluation and direct the subject 
to assess the site. The staff member should not influence the subject’s assessment. 
 
The study staff member will report the LSR grade the subject indicates in the source 
document. Both the subject and the study staff member must sign/initial the source 
document to indicate the subject performed the LSR as instructed. 
 
The subject should report the one integer that best describes average overall severity of 
each LSR symptom for the target lesion site using the scale below: 
 
Local Skin Reactions 
Grade 
Descriptor 
0 
None 
1 
Mild 
2 
Moderate 
3  
Severe 
 
6.2.2. 
Vital signs 
Vital signs will be measured by a qualified staff member at Visit 1, Visit 2 prior to 
randomization, and at Visit 8. The following items will be measured: 
 Body temperature 
 Pulse rate 
 Respiration rate 
 Blood pressure (systolic and diastolic) after the subject sits quietly for at least 5 
minutes 
 Height (at Visit 1 only) 
 Weight (at Visit 1 only). 
 

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Any measure that is, in the opinion of the investigator, abnormal AND clinically 
relevant (CR) must be recorded as history if found prior to the first study medication 
application or as an AE if found after the first study medication application begins 
(Section 7.1).  
 
A systolic blood pressure >140mm Hg or a diastolic blood pressure >90mm Hg is 
considered abnormal and therefore must be defined as CR or not clinically relevant 
(NCR) on the comments page of the CRF.  
 
A weight >300 lbs. is considered abnormal and therefore must be defined as CR or NCR 
on the comments page of the CRF.  
 
6.2.3. 
Clinical laboratory sampling 
Non-fasting samples for clinical laboratory analysis will be collected by a qualified staff 
member at Visit 1, at Visit 2 prior to randomization and at Visit 8. The following tests, at 
a minimum, will be conducted: 
 
Chemistry Panel 
Complete Blood Count 
Albumin 
Hematocrit 
Alkaline phosphatase 
Hemoglobin 
Alanine aminotransferase (ALT) 
Platelet count 
Aspartate aminotransferase (AST) Red blood cell morphology 
Blood urea nitrogen (BUN) 
Red blood cell count 
Bicarbonate 
White blood cell count 
Calcium 
White blood cell differential 
Chloride 
    % & absolute 
Creatinine 
    Basophils 
Glucose 
    Eosinophils 
Lactate dehydrogenase (LDH) 
    Lymphocytes 
Phosphorus 
    Monocytes 
Potassium 
    Neutrophils 
Sodium 
 
Total bilirubin 
 
Total protein 
 
Uric acid 
 
 
The results of the clinical laboratory tests will be reported on the laboratory’s standard 
reports. The investigator must note NCR or CR to define the clinical relevance of any 
result that is outside the normal range for the laboratory. The investigator must date 
and initial every laboratory report.  
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
The investigator must review the Visit 1 laboratory results for each subject prior to Visit 
2. The subject must not be randomized at Visit 2 if any of the Visit 1 results are outside 
normal range for the laboratory AND, in the opinion of the investigator, CR. 
 
The investigator must report all laboratory results that are BOTH outside the normal 
range for the laboratory AND, in the opinion of the investigator, CR as medical history 
if found prior to the first study medication application or as an AE if found after the 
first study medication application begins (Section 7.1). The investigator must review all 
laboratory reports in a timely manner 
 
6.2.4. 
Urine pregnancy tests 
The investigator or designee will perform a urine pregnancy test for subjects who are 
WOCBP (Section 6.2.4) at Visit 1, at Visit 2 prior to randomization and at Visit 8. The 
urine pregnancy test kits used must have a minimum sensitivity of 25-mIU ß-
HCG/milliliter (mL) of urine.  
 
Subjects who are WOCBP must have a negative pregnancy test result at Visit 1 to 
continue in the study and at Visit 2 to be randomized. 
 
If the result of any post-randomization urine pregnancy test is positive, the subject will 
be withdrawn from the study and the subject’s pregnancy documented and followed 
(Section 8). 
 
6.3. 
Other Evaluations 
6.3.1. 
Demographics and medical history 
At Visit 1, the investigator or designee will interview each subject to obtain 
demographic information including date of birth, sex at birth, Fitzpatrick skin type, race 
and, if appropriate, ethnicity.  
 
At Visit 1, the investigator must determine each subject’s Fitzpatrick skin type. 
 
The investigator or designee will interview each subject to obtain medical history 
information related to all medical conditions and disease states that, at Visit 1: 
 Are ongoing 
 Require concomitant therapy 
 Are, in the opinion of the investigator, relevant to the subject’s study 
participation. 
 

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6.3.2. 
Standardized photography 
At Visits 1, 2, 4 and 8 an investigational center staff member other than the investigator, 
at one selected center ONLY, will take standardized color photographs of the target 
lesion.  
 
Target lesion photographs will be digitally modified prior to any publication to ensure 
the subject’s identity is not revealed. 
 
The photographs are to document the appearance of the subjects’ target lesion. 
 
At study visits where a study medication application is performed (i.e., Visit 2 and 
potentially Visit 4) the photographs must be taken prior to the study medication 
application. 
 
Care must be taken to ensure the same lighting, background, subject positioning 
relative to the camera and camera settings are used for each photograph.  
 
Equipment, supplies, training and detailed instructions for obtaining and managing the 
photographs will be provided to the investigational center prior to the initiation of 
subject enrollment.  
 
7. 
ADVERSE EVENTS 
Adverse events will be monitored throughout the study and immediately reported on 
the appropriate Aclaris Therapeutics, Inc. AE CRF.   
 
7.1. 
Definitions 
7.1.1. 
Adverse events (AE) 
An AE is any untoward medical occurrence in a patient or clinical investigation subject 
administered a study medication(s) and which does not necessarily have a causal 
relationship with the study medication.  An AE can therefore be any unfavorable and 
unintended sign or symptom associated with the use of a study medication (including 
an abnormal laboratory finding), whether or not related to the study medication.  
 
Thus any new, clinically relevant worsening of an existing sign, symptom or disease, 
should be considered an AE.  
 
 
 

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Worsening of any of the target lesion assessments should be reported as an AE ONLY 
if the use of the study medication is interrupted or discontinued or if therapy is 
required to manage the event.  
 
The investigator must, for any AE associated with a target lesion, question the 
subject in detail to determine if there are any confounding factors (e.g., irritation by 
clothing or activity, sunburn) for any such AE.  
 
Report any event that requires use of the eyewash kit (Section 5.7.6) as an AE for “eye 
irritation”. For all AEs of this type: 
 Contact the medical monitor (see contact information on Page 1, or in Section 
7.2.2) immediately (within 24 hours) 
 Unblind the study medication for the subject (Section 5.10.2) 
 Arrange for the subject to be transported to the most appropriate hospital 
emergency room (ER) and provide the study medication identification 
information to the appropriate ER staff 
 Follow the course of the AE  
 Report the event as an SAE if appropriate (Section 7.1.2). 
 
Every new episode or clinically relevant worsening of a chronic condition (e.g., 
headaches, seasonal allergies, depression, and hypertension) should be reported as a 
separate AE, even if the condition is reported in the subject’s medical history. 
 
The investigator should, when certain, report a diagnosis rather than the signs, 
symptoms or clinically relevant abnormal laboratory values associated with the AE. 
Otherwise, signs, symptoms or abnormal laboratory values may be used to describe the 
AE. 
 
Any CR abnormality discovered prior to the first study medication application should 
be reported as medical history, not as an AE. 
 

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7.1.2. 
Serious adverse event (SAE) 
A Serious Adverse Event is any untoward medical occurrence that at any dose: 
 Results in death 
 Is life threatening 
 Requires inpatient hospitalization or prolongation of existing hospitalization 
 Results in persistent or significant disability/incapacity, or 
 Is a congenital anomaly/birth defect 
 Is an important medical event. 
 
The term “life threatening” refers to an event in which the subject was at risk of death at 
the time of event; it does not refer to an event that hypothetically might have caused 
death if it was more severe. 
 
Inpatient hospitalization is considered to have occurred if the subject is admitted to the 
hospital on an in-patient basis, even if released the same day. Prolongation of 
hospitalization is defined as an additional night stay in the hospital. Hospitalization for 
a diagnostic test (even if related to an AE) or elective hospitalization that was planned 
before study enrollment (signing the ICF) is not themselves reasons for an event to be 
defined as a SAE. 
 
Important medical events are those that may not be immediately life threatening, result 
in death or hospitalization, but are clearly of major clinical significance and may 
jeopardize the subject or require intervention to prevent one of the outcomes listed in 
the SAE definition above. These should also usually be considered serious. Examples of 
such events are intensive treatment in an emergency room or at home for allergic 
bronchospasm, blood dyscrasia or convulsions that do not result in hospitalization. 
 
7.1.3. 
Unexpected adverse event 
An AE is considered unexpected if it is not listed in the Investigator Brochure or is not 
listed at the specificity or severity that has been observed. 
 
7.1.4. 
Adverse event reporting period 
The investigator must start reporting non-serious AEs starting with the subject’s first 
study medication application and continuing until the end of the subject’s last study 
visit. Reporting for SAEs must start when the subject signs the ICF and continue until 
the end of the subject’s last visit. 
 

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7.1.5. 
Severity 
The investigator is to define the severity of each AE using the following definitions as a 
guideline. The investigator will consider the range of the possible severity of the event 
and identify the severity that is the most appropriate according her/his medical 
judgment. 
 
Mild – Awareness of signs or symptom, but easily tolerated 
Moderate – Discomfort, enough to cause interference with usual activity 
Severe – Incapacitating with inability to perform usual activity. 
 
7.1.6. 
Relationship to study medication 
The investigator will determine if there is a reasonable causal relationship between the 
study medication and an AE or not. The investigator will use her/his best medical 
judgment and consider all relevant factors (e.g., temporal relationship, location of the 
event, the subject’s relevant medical history, concomitant therapies and concurrent 
conditions) to determine the relationship of the AE to the study medication. The 
investigator will define the relationship of an AE to the study medication by selecting 
one of the following categories: 
 
Related – There is a reasonable possibility that there is a causal relationship 
between the study medication and the AE. 
 
Not Related – There is not a reasonable possibility that there is a causal 
relationship between the study medication and the AE. 
 
The term “reasonable causal relationship” means there are facts or arguments to 
suggest a causal relationship (International Conference on Harmonization (ICH) E2A). 
 
7.2. 
Reporting Procedures 
7.2.1. 
Procedures for reporting adverse events 
At each post enrollment visit, the investigator will question the subject to elicit AEs 
using a non-directive question such as “Has there been any change in your health since 
the previous study visit?”   
 
The investigator/designee will monitor the subject for at least 20 minutes after the 
Application Completion Time at Visit 2 and at Visit 4 to elicit AEs in a similar manner. 
 

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If appropriate, based on the subject’s response to non-directed questioning regarding 
AEs, the investigator will follow-up with directed questions and appropriate 
evaluations.  
 
Any AE noted during the reporting period (Section 7.1.4) must be reported in the source 
documents and on the appropriate AE CRF.  
 
AEs that are defined as “Not Related” to the study medications will be followed until 
they are resolved or until the subject’s last study visit. AEs that are defined as “Related” 
to the study medications will be followed until they are resolved or, if not resolved after 
the subject’s last study visit, until in the opinion of the investigator, the AE reaches a 
clinically stable outcome with or without sequelae. 
 
7.2.2. 
Procedure for reporting a serious adverse event 
Upon becoming aware of a SAE occurring during the AE reporting period, whether or 
not related to the study medications, the investigator must: 
 
1. 
Take the appropriate medical action to ensure the subject’s safety 
2. 
Immediately inform the Medical Monitor of the SAE by telephone: 
 
Stuart D. Shanler, M.D. 
Aclaris Therapeutics, Inc. 
101 Lindenwood Drive 
Suite 400 
Malvern, PA 19355 
Office telephone: (484) 321-5555 
Mobile telephone: (917) 841-9859 
SAE facsimile: (484) 324-2359 
E-mail: sshanler@aclaristx.com 
 
3. 
Within 24-hours complete, as fully as possible, an AE CRF and an SAE form; fax or 
e-mail the forms and any other relevant information (e.g., concomitant medication 
CRF, medical history CRF, laboratory test results) to the Aclaris Therapeutics, Inc. 
Medical Monitor. 
4. 
Monitor and document the progress of the SAE until it resolves or, if not resolved 
after the subject’s last study visit, until in the opinion of the investigator the AE 
reaches a clinically stable outcome with or without sequelae AND the investigator 
and Aclaris Therapeutics, Inc. Medical Monitor agree that the SAE is satisfactorily 
resolved. 
5. 
Inform the Aclaris Therapeutics, Inc. Medical Monitor of SAE updates by 
telephone followed by an SAE form update sent by fax or by e-mail. 

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6. 
Comply with the appropriate regulatory requirements and Aclaris Therapeutics, 
Inc. instructions regarding reporting of the SAE to the responsible Institutional 
Review Board (IRB) or Ethics Committee (EC). 
 
8. 
PREGNANCY 
WOCBP include any female who has experienced menarche and who has not 
undergone successful surgical sterilization (e.g., hysterectomy, hysteroscopy, bilateral 
tubal ligation, bilateral oophorectomy or bilateral minilaparotomy) or is not 
postmenopausal. Postmenopausal is defined as ≥12 months with no menses without an 
alternative medical cause. Women who are WOCBP and are using an active method of 
birth control, are practicing abstinence or where the partner is sterile (e.g., vasectomy), 
should be considered to be WOCBP. 
 
All WOCBP must use an effective method of birth control during the course of the 
study, in a manner such that risk of failure is minimized. Effective methods of birth 
control approved for use in this study are: 
 Implants 
 Injectable 
 Patch 
 Combined oral contraceptives 
 Barrier methods (e.g., condom, diaphragm) with spermicide 
 ParaGard® and Mirena® intrauterine devices. 
 
Prior to trial enrollment, WOCBP must be advised of the importance of avoiding 
pregnancy during trial participation and the potential risk factors for a pregnancy.  The 
subject must sign an informed consent form documenting this discussion.  During the 
trial all WOCBP will be instructed to contact the investigator immediately if they 
suspect they might be pregnant (e.g., missed or late menstrual period). 
 
If a subject or investigator suspects that the subject may be pregnant prior to study 
medication administration, the study medication must be withheld until the results of a 
pregnancy test are available.  If pregnancy is confirmed, the subject must not receive 
study medication and must be discharged from the study.  
 
If, following study medication administration, it is determined that the subject may 
have been or was pregnant at the time of study medication exposure (including at least 
2 days after study medication administration) the investigator must immediately notify 
the Aclaris Therapeutics, Inc. Medical Monitor and record the event on a pregnancy 
surveillance form. While not an AE or SAE, the investigator must report every 
pregnancy using a pregnancy surveillance form and follow the reporting procedures 
described for SAE reporting (Section 7.2.2). 

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Protocol-required procedures for trial discontinuation and follow-up must be 
performed on the subject unless contraindicated by pregnancy (e.g., x-ray studies). 
Other appropriate pregnancy follow-up procedures should be considered if indicated. 
In addition, the investigator must report to Aclaris Therapeutics, Inc.’s Medical Monitor 
on the pregnancy surveillance form, follow-up information regarding the course of the 
pregnancy, including perinatal and neonatal outcome. Infants should be followed for a 
minimum of six weeks. 
  
9. 
STATISTICAL ANALYSES 
9.1. 
Statistical Analysis of Clinical Indices 
The primary effectiveness analysis will consist of mean change from baseline to Visit 8 
PLA performed using Analysis of Covariance (ANCOVA) with baseline PLA as the 
covariate.  The analysis will be performed at each post-baseline visit with emphasis on 
Visit 8.  Comparisons between vehicle and each active treatment group will be 
performed within the model using least-squares means and the common error term.    
The primary efficacy analyses will be based on the per protocol (PP) population, 
defined as all randomized subjects who completed the study with no major protocol 
violation.  
 
A secondary efficacy analysis of a separate comparison between each active treatment 
group and the vehicle treatment group based on the proportion of subjects whose target 
lesion is judged to be clear on the PLA (PLA = 0) at Visit 8.  A separate Cochran-Mantel-
Haenszel (CMH) test stratified by Site will be used for each comparison.  A secondary 
efficacy analysis will also be conducted using this same methodology, but based on 
SSA.   
 
Secondary analyses will initially be performed on the PP population, but will also be 
performed on the intent-to-treat (ITT) population defined as all randomized subjects 
with non-missing data at baseline and at least one post-baseline visit.  As a secondary 
analysis, the primary efficacy analysis will be performed using the ITT population.  For 
all ITT-population analyses, missing efficacy data will be imputed from the last non-
missing post-baseline visit carried forward to subsequent missing visits (LOCF).    
 
For all analyses, two-tail alpha will be set to 0.05 with no adjustment for multiple 
comparisons.  ANCOVAs will include Site in the model if doing so improves the 
sensitivity of the model for comparing treatment groups.  As a sensitivity analysis, the 
primary efficacy analysis will also be run including Site and the Treatment-by-Site 
interaction.  If the interaction term is associated with p < 0.10 then treatment group 
means for each Site will be examined individually to understand potential site 
differences.  Sites with less than two completed blocks of subjects will be pooled with 
other such Sites to achieve new pooled analysis Sites that meet this criterion.  Sites will 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
first be ranked by sample size and then pooled in that order until each new pooled 
analysis Site meets the two-block threshold. 
 
9.2. 
Statistical Analysis of Safety Data 
Descriptive statistics will be calculated on the safety parameters using the ITT 
population. The proportion of subjects with treatment-emergent adverse events will be 
tabulated and presented by treatment and Medical Dictionary for Regulatory Activities 
(MedDRA) System Organ Class. Vital signs, LSR scores and clinically relevant abnormal 
laboratory results will also be tabulated and presented by study medication. No 
inferential testing will be performed. 
 
Data from all randomized subjects will be presented and summarized. Safety 
summaries by study medication group will include listings by study medication of 
adverse events incidences within each MedDRA System Organ Class, and changes from 
pre-application values in vital signs. Adverse event summaries will be presented by 
study medication showing the proportion of subjects experiencing adverse events, both 
overall and by MedDRA System Organ Class. 
 
9.3. 
Sample Size 
The sample size of 32 subjects per treatment group completing the study (as defined for 
the PP population) is based on previous data suggesting that the proportion of subjects 
with a clear lesion (PLA=0) at Visit 8 would be at least 0.325 for the highest active dose 
group with no more than 1 vehicle subject (a proportion of approximately 0.031) 
achieving a clear lesion at Visit 8.  Under these assumptions this study would have 
approximately 87% power with two-tail alpha = 0.05, using the more conservative 
secondary efficacy endpoint. The ANCOVA analysis of the primary endpoint, mean 
change from baseline PLA for the PP population, is expected to be more sensitive than 
the above endpoint, with power greater than 90% under similar assumptions.  

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
10. 
TRAINING, MONITORING, DATA MANAGEMENT AND QUALITY 
ASSURANCE 
10.1. 
Training 
For each investigational center, there will be an initiation visit prior to enrolling any 
study subjects. 
 
It is strongly recommended that all investigators, other evaluators, study nurses, study 
coordinators or other applicable personnel attend this visit.  During this visit, 
participants will be trained to the protocol, study specific procedures, and the CRFs.  
Those unable to attend the initiation visit must receive on-site training from an 
appropriately trained individual prior to participating in any of the procedures and 
evaluations in this study.  
 
Clinical Research Associates (CRAs) and other applicable personnel will be trained 
prior to study initiation to familiarize CRAs with the disease, the Standard Operating 
Procedures (SOPs), the protocol and other study specific items.  Team organization, 
communication and operational issues will also be discussed. 
 
Aclaris Therapeutics, Inc. will provide an investigational center file to each center. 
 
10.2. 
Monitoring 
The conduct of the study will be closely monitored by representatives of Aclaris 
Therapeutics, Inc. to verify adherence to ICH Good Clinical Practice (GCP) guidelines 
and applicable SOPs.  Reports of these verifications will be archived with the study 
report.  The investigator will allow the Aclaris Therapeutics, Inc. representatives 
designee and/or and any regulatory agency to have direct access to all study records, 
CRFs, corresponding subject medical records, study medication dispensing records and 
study medication storage area, and any other documents considered source 
documentation.  The investigator also agrees to assist the representative, if required. 
 
10.3. 
Data Management 
Data-management activities of this study will be sub-contracted. 
 
Edit checks and review processes will be performed by the sub-contractor until all data 
clarifications are resolved. The data will be exported to be stored in SAS datasets (or 
equivalent) by the sub-contractor. After all data clarifications are resolved and subject’s 
evaluability is determined, the database will be locked. 
 

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10.4. 
Quality Assurance 
The study is conducted under the sponsorship of Aclaris Therapeutics, Inc. in 
compliance with the applicable regulatory requirements as well as applicable ICH 
guidelines, Helsinki Declaration, and in respect of the Aclaris Therapeutics, Inc. and/or 
sub-contractor SOPs for study conduct and monitoring. 
 
Audits may be carried out by the Aclaris Therapeutics, Inc. or Aclaris Therapeutics, 
Inc.’s representatives and inspections may be performed by regulatory authorities or 
IRB/ECs before, during or after the study.  The investigator will provide the 
auditing/inspecting group direct access to all study records (e.g., CRFs, subject medical 
records, study medication dispensing records) and the investigational center study 
facilities. The investigator and study staff will be available and will assist the 
auditing/inspecting groups as appropriate.  
 
 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
11. 
ETHICS AND GENERAL STUDY CONDUCT CONSIDERATIONS 
11.1. 
Institutional Review Board (IRB)/Ethics Committee (EC) 
This protocol, informed consent form, any information provided to subjects, subject-
recruiting advertisements, and any amendments to these items will receive IRB/EC 
approval prior to use. 
 
The IRB/EC must receive a copy of the Investigator’s Brochure, all protocol 
amendments, safety reports and other study related information as required by 
regulation or the IRB/EC procedures. 
 
11.2. 
Ethical Conduct of the Study 
The rights, safety and well-being of the subjects are the most important considerations 
in this study and take priority over the interests of society and science.  
 
This study will be conducted in accordance with the ethical principles originating from 
the Declaration of Helsinki, the ICH E6 GCP guideline, local regulatory requirements 
and, at US investigational centers, in compliance with the HIPAA. The study will be 
conducted in compliance with the IRB/EC approved version of the protocol and any 
applicable amendments. 
 
This protocol, informed consent form, any information provided to subjects, subject-
recruiting advertisements, and any amendments to these items will receive IRB/EC 
approval prior to use. Subjects will provide voluntary informed consent prior to 
initiation of any study related procedures. 
 
11.3. 
Subject Information and Consent 
All subjects who participate in this study must be fully informed about the study in 
accordance with the GCPs, federal regulations, local regulations and, at US 
investigational centers, with HIPAA.  The ICF will contain all the required elements in 
compliance with the current ICH E6 GCP guideline, local regulatory requirements and, 
at US investigational centers, in compliance with HIPAA.  
 
The investigator must have a defined process for obtaining voluntary informed consent 
from every subject.  
 
The ICF, approved by an IRB/EC, will be fully explained to the subject.  Prior to any 
study related procedures, including washout from therapies, the subject will voluntarily 
sign and date the ICF. The investigator must maintain each subject’s ICF in the 
investigational center’s study file and must provide each subject with a copy of the 
signed and dated ICF. 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
 
11.4. 
Study Conduct and Protocol Amendments 
With the exception of eliminating an immediate hazard to a subject, the investigator 
should not deviate from the protocol or implement any changes without prior written 
approval from the Aclaris Therapeutics, Inc. and prior review and documented 
approval from the IRB/EC. 
 
Changes that involve only logistical or administrative changes are allowed.  The 
investigator should document and explain any deviation from the protocol. 
 
11.5. 
Regulatory Documents 
The investigator must maintain a study file containing current and complete regulatory 
documentation in compliance with the current ICH E6 GCP guideline. This file will be 
reviewed as part of the routine monitoring for this study. 
 
11.6. 
Contractual Requirements 
A contractual agreement will be signed between Aclaris Therapeutics, Inc. and each 
investigator.  This document will contain supplemental information, including financial 
terms, confidentiality, study schedule, third party responsibility, and publication rights. 
 
11.7. 
Data Collection and Archiving 
11.7.1. 
Data collection  
The Investigator must maintain required records for all study subjects.  Data for this 
study will be recorded in the subject's source document and on the CRFs.  All data on 
these CRFs should be recorded completely and promptly.  A copy of the completed 
CRFs for each subject will be retained by the investigational center. 
 
Records of the subject’s participation in this study will be held confidential except as 
disclosure is required by law. The study doctor, the sponsor, persons working on behalf 
of the sponsor, and under certain circumstances, the United States Food and Drug 
Administration and the Institutional Review Board will be able to inspect and copy 
confidential study-related records that identify subjects by name. Therefore, absolute 
subject confidentiality cannot be guaranteed. If the results of this study are published or 
presented at meetings, the subject’s identity will not be revealed. 
 

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11.7.2. 
Source documentation 
Investigators must keep accurate separate records (other than the CRFs) of all subjects' 
visits that include all pertinent study related information.  A statement should be made 
indicating that the subjects have been enrolled in this clinical study, and have provided 
written informed consent.  Any AEs must be completely documented. 
 
Source documentation includes results of any diagnostic tests conducted during the 
study.   
 
11.7.3. 
Archiving 
All pertinent data, samples, photographs, correspondence, original or amended 
protocol, reports and all other material relating to the study will be maintained securely 
in Aclaris Therapeutics, Inc. /contract research organization/investigator archives for 
the legally required duration for archiving. 
 
The investigator should maintain the essential study documents as specified in ICH 
GCP, and in compliance with all regulatory requirements. The investigator should 
ensure these documents are protected from accidental destruction or disposal. 
 
If the Investigator needs to re-assign responsibility for maintaining these documents 
(e.g., due to retirement) it must be transferred to a person willing to accept this 
responsibility.  The investigator must notify the Aclaris Therapeutics, Inc., in writing, of 
the name and address of the new individual. 
 
 
 

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Date: 01-JUL-2014                                                                                                 Supersedes: 29-JUN-2014 
12. 
SUBJECT INSTRUCTION SHEET 
The investigator or designee will dispense a copy of the subject instruction sheet to each 
subject at Visit 1.  
 
Aclaris Therapeutics will provide a supply of the subject instruction sheet to each 
investigational center prior to the initiation of subject enrollment.