Understanding Alopecia Areata

Sudden hair loss in a certain area, such as the scalp or beard, is called alopecia areata and is sometimes caused by an autoimmune illness. Alopecia universalis is a condition in which all body hair may be lost. The total loss of all body hair, including eyebrows, eyelashes, facial and body hair, and hair on top of the head, is known as alopecia totalis. Unless hair loss is widespread, new hair may grow back within a few months, but with no color.