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What causes alopecia?

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Answer:

Alopecia areata is the most common form of an autoimmune skin disease resulting in patches of hair loss on the head or scalp. Alopecia areata usually starts with a small patch of hair loss and continues with one or more small, round patches of hair loss around the head in no predictable pattern and for no other known reason or disease.

A healthy human immune system contains an effective set of weapons against viruses, bacteria and parasites that can attack your body. But when a person's immune system mistakenly attacks the body itself, it is called autoimmunity and results in a disease such as alopecia areata, depending on which cells in the body are being attacked.

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