Hair Loss: Alopecia Areata
Alopecia areata is a disorder characterized by loss of hair. Sometimes, this means simply a few bare patches on the scalp. In other cases, hair loss is more extensive. Although the exact cause is not known, this is thought to be an autoimmune disorder that affects as many as 6.8 million people in the U.S. While hair loss is usually confined to the head and face, the entire body may be involved.