ABSTRACT
Female pattern androgenic alopecia (FAGA) is a non-scarring alopecia that mostly affects post-menopausal women; in such cases, reduced hair density occurs, over the crown and frontal scalp, while the front hairline is mainly unaffected. FAGA is a chronic disease, typically realized by the patient years after its commencement. The pathogenesis of FAGA is multi-factorial. Estrogens play an unclear role in FAGA. On the one hand, estrogens may inhibit 5α-reductase and improve hair loss. The differential diagnosis of FAGA includes: Chronic tellogen effluvium, post-partum hair loss, diffuse alopecia areata, trichotillomania, frontal fibrosing alopecia, and other hair loss conditions caused by hypothyroidism and iron deficiency. FAGA is a chronic disease and poses only cosmetic concerns. It's significantly negative psychological impact on women's everyday life is indicative of longstanding treatment. Light sources of different wavelengths are currently used for the treatment of FAGA, but the exact details of their mechanism are not yet known.
