Alopecia Areata: What Is It?

Alopecia areata is a type of hair loss that occurs when your immune system attacks your hair follicles. At the onset of alopecia areata, clumps of hair start falling out. This results in totally smooth round bare spots on the scalp. Sometimes the hair becomes thinner, and there doesn’t seem to be any noticeable patches of baldness. Learn what you can do about it.

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