[Diffuse alopecia].

Diffuse alopecia is a clinical entity with a diversified aetiology, that allows to distinguish from circumscribed or cicatricial alopecia or male baldness. It may be explained by several causes: endocrinological, andrological or thyroid dysfunction, pharmacological treatment or side effects of a drug, microbial infection, etc. Its treatment falls under three groups: hormonal (cyproterone), vitamin (B5, B8), amino acids (cystine) or local (minoxidil, progesterol).