DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Alopecia areata. View of a patch of hair loss on the scalp of a patient suffering from alopecia areata. Alopecia areata affects both sexes, and is a condition in which hair falling out in patches may occur suddenly at any age. The cause is unknown, but it is sometimes associated with stress or a sudden emotional shock. Usually the hair returns to normal within a few months. There is no specific treatment.
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