White hair in alopecia areata: Clinical forms and proposed physiopathological mechanisms

•White hair phenomena in alopecia areata most commonly can be observed transiently during the regrowing phase, but rare cases can become permanent. Additionally, it can be a manifestation of a diffuse form of AA, called Canities subita, in which pigmented hairs are the main target. Dermatologist should have in mind this uncommon phenomena in the approach of a patient with hair whitening.

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