to assess the cutaneous irritation and sensitization potential of a cosmetic facial product using a human repeat insult patch test (hript) in healthy participants

Conditions: Skin Care

Summary: the objective of this clinical study is to assess the irritation and sensitisation potential of a cosmetic test product after repeated semi-occlusive patch applications to healthy human participants by following a conventional hript methodology under supervision of a dermatologist.

the first phase of the study is an induction phase; a known amount of each product (test and control) is applied, under a semi-occlusive patch. patches will remain on the skin for 48 (±2) (weekdays) or 72 (±2) (including inclusive weekends) hours during this phase. induction phase lasts for 3 weeks. after the induction phase participants will enter a rest phase of 2 weeks duration, during which no patches are applied. after the rest phase, participants will return to the clinical site for the challenge phase. in this phase a challenge patch containing the test and control products is applied to virgin skin for 48 (±2) hours then assessed 30 minutes (maximum 1 hour) following removal, 24 (± 2) and 48 (±2) hours later.

Eligibility criteria:
inclusion criteria: * demonstrates understanding of the study procedures, restrictions and willingness to participate as evidenced by voluntary written informed consent and has received a signed and dated copy of the informed consent form * good general and mental health with, in the opinion of the investigator or medically qualified designee no clinically significant and relevant abnormalities in medical history or upon physical examination * healthy, intact skin at the proposed application site; dorsum (scapular region) * clinical assessment for eligibility (at visit 1 and visit 2 - if not combined) by a dermatologist to ensure participant is free of clinically relevant dermatological conditions * fitzpatrick phototype i to iv * agreement to comply with the procedures and requirements of the study and to attend the scheduled assessment visits exclusion criteria: * women who are known to be pregnant or who are intending to become pregnant over the duration of the study * women who are breast-feeding * any history of significant dermatological diseases or conditions or medical conditions known to alter skin appearance or physiologic response (e.g. diabetes,) which could, in the opinion of the investigator, preclude topical application of the investigational products and/or interfere with the evaluation of the test site reaction * presence of open sores, pimples, or cysts at the application site * active dermatosis (local or disseminated) that might interfere with the results of the study * considered immune compromised * history of diseases aggravated or triggered by ultraviolet radiation * participants with dermatographism * currently using any medication which in the opinion of the investigator, may affect the evaluation of the study product, or place the participant at undue risk * use of the following topical or systemic medications: immunosuppressants, antihistamines, non-hormonal anti-inflammatory drugs, and corticosteroids up to 2 weeks before screening visit * oral or topical treatment with vitamin a acid and/or its derivatives up to 1 month before the screening visit * intention of being vaccinated during the study period or has been vaccinated within 3 weeks of the screening visit * currently receiving allergy injections, or received an allergy injection within 7 days prior to visit 1, or expects to begin injections during study participation * previous history of atopy, allergic reactions, irritation or intense discomfort feelings to topical-use products, cosmetics or medication * study participants with a history of allergy to the study material/product, hypoallergenic tape, or to the cotton patches * history of sensitisation in a previous patch study * participation in another clinical study (including cosmetic studies) or receipt of an investigational drug within 30 days of the screening visit * previous participation in this study * recent history (within the last 5 years) of alcohol or other substance abuse * intense sunlight exposure or sun tanning sessions up to 30 days before the screening evaluation * intention of bathing (in the sea or a pool), sauna, water sports, or activities that lead to intense sweating * any participant who, in the judgment of the investigator, should not participate in the study * any skin marks on the test site that might interfere with the evaluation of possible skin reactions (e.g. pigmentation disorders, vascular malformations, scars, tattoos, excessive hair, numerous freckles) * prisoner or involuntary incarcerated participant * participant from an indigenous tribe * an employee of the sponsor or the study site or members of their immediate family