In alopecia areata, the affected hair follicles are mistakenly attacked by a person’s own immune system, which stops hair growth. It usually starts with one or more small, round, smooth bald patches on the scalp and can lead to total scalp hair loss (alopecia totalis) or complete body hair loss (alopecia universalis). In all cases, hair regrowth may occur even without treatment and even after many years!
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