Alopecia Areata Basics: Overview, Symptoms, and Causes
https://www.niams.nih.gov/health-topics/alopecia-areata/basics/symptoms-causes
WEBJun 14, 2022 · Alopecia areata is a disease that causes hair loss. In alopecia areata, the immune system attacks the structures in skin that form hair (hair follicles). Alopecia areata usually affects the head and face, though hair can be lost from any part of the body. Hair typically falls out in small, round patches about the size of a quarter.
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