Alopecia areata is a form of hair loss that affects patches of the scalp and, in rare cases, other parts of the body. It is an autoimmune disorder. Smooth, round patches of hair loss appear over a few weeks in people with alopecia areata. The scalp is usually affected, but patches can appear on other parts of the body. Raised spots, or follicular papules, appear in reddened plaques or patches about 1 inch across, but sometimes larger. It may begin with one or more lesions, or it may begin with a single lesion that progresses to multiple lesions over the course of several weeks or months. Hair loss is common when a lesion affects the follicles. Fingernail and toenail abnormalities can also occur. Hair grows back in some cases, but symptoms may reoccur. Even after other symptoms have subsided, some people's hair does not regrow. People who are losing their hair may experience anxiety and depression as a result.
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