What are possible causes of sudden loss of facial and body hair on women?

Alopecia Areata: The most common cause of sudden hair loss is called alopecia areata. This condition is unknown cause, but it is thought to be a temporary immune reaction against one's own hair follicles. Often seen in children in the spotty variant is known as alopecia areata. If the spots are everywhere it is known as alopecia totals. It is necessary to see a dermatologist for this diagnosis to be made correctly.