Demonstration of Carbonyl Stress on Hair Follicles

Inclusion Criteria: Criteria related to the Population : * Women aged from 18 to 40 ans (included) * Phototype I à IV included, according to Fitzpatrick Classification * Hair length 5 cm on the sampling area (centro-parietal part) * Last shampoo at least 2 days before the inclusion visit, without application of styling product, care or water between this last shampoo and the inclusion * Informed consent signature Criteria related to the studied condition: * ET group: hair loss related to various etiologies evaluated by a questionnaire according to the investigator's opinion and positive pull test (at least 3 hair collected per lock of 50 to 60 hair) AND * Control group : no hair loss, evaluated by the questionnaire and negative pull test (less than 3 hair collected per lock of 50 to 60 hair) Exclusion Criteria: Criteria related to Population : * Menopause * Pregnancy, breastfeeding, childbirth for less than 6 months Criteria related to Pathology : For both groups: * Alopecia causing hair loss on the upper part of the scalp * Dermatological pathology or evolving cutaneous lesion in the scalp * Control group only: * Chronic unstabilized condition * Acute evolving pathology Criteria related to theTreatments : For both groups: * Use for at least 1 month of Minoxidil, Aminexil in the 3 months before inclusion or ongoing * Systemic treatment affecting hair growth * Any treatment or dietary supplement for antioxidant or capillary Control group only: * Treatment of general thyroid disorders initiated or modified for less than 3 months prior to inclusion * Treatment of anemia if started less than 3 months before inclusion * General treatment initiated or modified for less than 3 months prior to inclusion in the study