Evaluation of the Efficacy of Systemic Treatments for Alopecia (ESTAA)

Inclusion Criteria: * Patient with severe alopecia * Has received at least one systemic treatment for at least 3 months (among methotrexate, intravenous or oral corticosteroid therapy, Ciclosporin, UVA/UVB phototherapy) * Patient affiliated to a social security scheme * Age greater than or equal to 18 years Exclusion Criteria: * Patients under legal protection (guardianship, curatorship, etc.) * Refusal to participate * Other cause of alopecia * Follow-up less than 3 months * Age under 18 years