PIHPRutina de La Roche Posay para la hiperpigmentación facial postinflamatoria

The sample size of this study is 80 participants; 40 subjects testing Niacinamide A serum and UV Mune and 40 subjects testing Eucerin Thiamidol anti-pigment serum and Eucerin SPF 50+. The secondary objectives are: * the effect on the cutaneous acceptability by clinical examination under dermatological control * the effect of the product on acne lesions is assessed by comparing the number of elements on the face before application and after product use * the effect on acne severity according to the Global Acne Evaluation * the mean darkness of the post-inflammatory hyper-pigmentation (PIHP) lesions. A statistical analysis of the following will be done: a comparison of the before/after application, a comparison of the values obtained from the comparison product/comparator product, and a comparison PIHP lesion/normal zone. The study endpoints are: * global acne evaluation scale * mean size, intensity, number of PIHP lesion * mean darkness of lesions * subject global assessment score * improvement in scores in a stigmatization questionnaire * satisfaction questionnaire