Causes of Alopecia areata

Alopecia areata (AA) is a common form of hair loss in humans; it is an autoimmune disorder with a vector, usually relapsing or remitting course that can be persistent – particularly when hair loss is extensive. After male and female pattern alopecia, alopecia areata is the most common nonscarring alopecia. Hair loss in alopecia areata typically has distinct clinical trends.