Alopecia areata is a disease that causes hair loss. Most people lose hair on their scalp or beard area, but hair loss can occur anywhere on your body. A board-certified dermatologist can tell you if ...

Alopecia areata (AA) is a nonscarring alopecia that appears to involve T-cell-mediated autoimmune pathology. Eighty percent of patients present with a single coin-shaped area of hair loss, usually ...