sunscreen efficacy against the reccurence of lesions post-sun exposure in acneic subjects

Conditions: Acne

Summary: the aim of this study is firstly to assess the tolerance of the sunscreen rv4857a-cd2110 after 28 days and 57 days of at least a twice daily on the study areas, secondly to assess anti-imperfection efficacy after 28 days and 57 days of use and its efficacy against recurrence of acne lesions post-sun exposure.

this is a monocentric study on adults and adolescents with acne prone skin on the face. this open-labelled study aim first to assess the dermatological and ophthalmological tolerance of the investigational sunscreen product rv4857a formula cd2110 after 28 days and, dermatological tolerance after 57 days of at least a twice daily on the study areas, under normal conditions of use, on 40 subjects intending to have a minimum of 10 days per month of sun exposure duration ≥ 1h, in the time slot 11am-4pm and intending to have a minimum of 4 swimming sessions (sea or swimming pool) during at least the first month of the study. secondary objectives : * to assess the anti-imperfection efficacy of the product during the summer * to assess the "non" rebound effect (non recurrence of acne) one month after stopping the application of the sunscreen and without any sun exposure at d85 (difference between d85 and d0) * to evaluate the impact on quality of life of subjects through cadi and dlqi questionnaires (or cdlqi questionnaire for adolescent from 12 to 16 years-old) completed at baseline, d29 and d57 the study includes 4 visits : * visit 1: inclusion visit (d1) * visit 2: intermediate visit (d29) * visit 3: intermediate visit "end of summer" (d57), a stop the application of the sunscreen product (and stop sun exposure) between visit 3 and the end of the study visit 4: end of study visit in autumn (d85) the theoretical study duration for each subject will be 85 days with at least 57 days of product use. the study interest areas are face and neck.

Eligibility criteria:
inclusion criteria: 1. related to the population: * females and/or males (with at least 25% of male) * age: adults from 18 to 40 years old and adolescent from 12 to 17 years old (33% to 50% of the total population) * considered "healthy subject" by the investigator * being of phototype i to iv * subject with combination to oily skin * subject who foresees sun exposure during the first 2 months of the study * subjects must be registered with health social security or health social insurance (if required by national regulations) * subject and/or parent(s)/legal representative(s) who have signed his/her/their written informed consent for his/her participation in the study (or his/her/their child participation in the study) and a photograph authorization * for woman of childbearing potential: committing herself to use effective contraceptive method since at least 3 months before the beginning of the study and committing to it throughout the study * regular users of very high protection sunscreen products. 2. related to the disease: * for adults and adolescents: subject with mild to moderate acne with a total of 10 to 40 acne lesions (at least 5 non-inflammatory lesions (open and closed comedones) and at least 3 to 10 inflammatory lesions (papules and pustules) maximum on the face, excluding the nose area), at the inclusion. * subject prone to have recurrence of acne lesions in autumn (declarative) exclusion criteria: 1. related to the population: * having participated in another clinical trial within 4 weeks before the inclusion visit and for a longer period if required in the investigator's opinion taking part or planning to participate in another clinical trial during the study in the same or another investigation centre * breastfeeding or pregnant or not willing to take necessary precautions to avoid pregnancy during the study and for at least 3 months before the inclusion visit (for the woman of childbearing potential) * subject or parent(s)/legal representative(s) deprived of freedom by administrative or legal decision or under guardianship * subject or parent(s)/legal representative(s) not able to be contacted in case of emergency * subject admitted in a sanitary or social facility * subject planning a hospitalization during the study 2. related to the disease * cutaneous pathology (psoriasis, atopic dermatitis, skin infectious disease of viral, bacterial, fungus or parasitic origin ...) or dermatological condition (especially pityriasis versicolor, severe pigmentation disorders) on the studied zone other than acne liable to interfere with the data of the study * severe acne * clinical signs of hormonal disfunctions or hyperandrogenism * excessive exposure to sunlight or uv-rays within the previous month * having history of abnormal reactions from exposure to sunlight * use of self tanning product during the previous month history of hypersensitivity or intolerance to any cosmetic product 3. related to treatments * use of a systemic or topical medication with anti-inflammatory or photosensitising products during the previous 2 weeks and for systemic medication with corticoids and/or antihistaminics during the previous 4 weeks * use of a systemic treatment for acne during the previous month for antibiotics, zinc gluconate and hormonal treatment and during the 6 previous months for isotretinoin * use of a topical treatment for acne during the previous month (benzoil peroxide, retinoid, antibiotics, azelaic acid...) * use of anti-acneic or anti-seborrheic cosmestic care (containing alpha hydroxy-acids, retinoic derivatives..) during the 15 previous days * use of other topical or systemic treatment during the previous weeks liable to interfere with the assessment of the cutaneous tolerance and efficacy of the studied product (according to the investigator's appreciation) * any surgery, chemical or physical treatment on the experimental area within the 12 months prior to the study or foreseeing it for the duration of the study * woman whose oral contraception is instaured or changed for less than 3 months

Keywords: sunscreen lesions post sun exposure anti-imperfections