Evaluation of the expression of corticotrophin-releasing hormone in the epidermis of 4 donors after an incubation of 3 hours in the presence of Medium (Ctrl), SA (P. acnes supernatant A), FM (P. acnes membrane fraction), LPS (E. coli Lipopolysaccharide), Zn (Zinc Gluconate) (scale: null labelling (0), very weak labelling (1), weak labelling (2), moderate labelling (3), strong labelling (4) and very strong labelling (5). (***p value < 0.05).