Alopecia Areata Incognita

September 2021 in “ CRC Press eBooks ”

Mariya Miteva

alopecia areata incognita diffuse alopecia acute telogen effluvium androgen dependent scalp telogen roots trichoscopy yellow dots short regrowing hairs dystrophic hairs steroid treatment androgenetic alopecia hair cycle mitotic activity telogen telogenic hair loss AAI steroids androgenic alopecia

TLDR Alopecia areata incognita causes sudden hair thinning, responds well to steroids, and is more common in those with genetic hair loss conditions.

Alopecia areata incognita (AAI) is a type of diffuse alopecia that causes acute hair shedding and pronounced thinning of the scalp in women, without signs of acute telogen effluvium. Clinical examination reveals reduced hair density, especially on the androgen dependent scalp, and a positive pull test for telogen roots at varying maturity stages. Trichoscopy shows yellow dots and short regrowing hairs, but no dystrophic hairs typical for diffuse alopecia areata. The prognosis for AAI is generally favorable with a rapid response to steroid treatment. AAI is more common in patients with androgenetic alopecia due to the shortening of the hair cycle, which reduces the number of follicles with high mitotic activity and increases the number of follicles with low mitotic activity that shift to telogen instead of becoming dystrophic, resulting in diffuse and telogenic hair loss.

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