Alopecia areata is an autoimmune disease that results in unpredictable hair loss. Your hair growth begins at the follicles, but the immune system attacks them. This condition is not contagious and does not make a person feel sick per say. However, the inflammation can lead permanent damage to some people.
The most common symptom of alopecia areata is hair loss. It usually happens in coin-sized patches on the head, but the condition can affect any hair site including the face. The loss of hair can occur suddenly within a few days or weeks. An itchy, burning sensation might be associated with the hair loss as well.
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