Alopecia areata (hair loss) on scalp. Side view of alopecia areata (hair loss) on the scalp in an adult male. Alopecia is a condition where hair falls out in large patches. It occurs in both sexes and may happen at any age. The cause is unknown, but is thought to be linked to a sudden emotional shock or stress. Usually hair growth returns to normal after a few months. There is no specific treatment for this disorder.
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