A 31-year-old female asked:
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what causes alopecia?i just found a bald spot in the back of my head thats the size of a half dollar.my brother and neice have alopecia.

1 doctor answer
Dr. Antoanella Calame
18 years experience Dermatology
Alopecia areata: Alopecia areata is an autoimmune disease. Autoimmune means that the body's immune system attacks the body. When alopecia areata develops, the body attacks its own hair follicles. A person's genetic makeup, combined with other factors, triggers this form of hair loss. People can have this type of hair loss at any age. Some patients with alopecia areata have a family member who also has the disease.
Answered on Apr 20, 2015

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