Alopecia Areata: Alopecia areata is a condition that causes round patches of hair loss, and can lead to total hair loss. Causes, incidence, and risk factors the cause of alopecia areata is unknown. About a fifth of people with this condition have a family history of alopecia. Alopecia areata is thought to be an autoimmune condition. This occurs when the immune system mistakenly attacks and destroys hair follicles.
Answered 9/28/2016
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