Alopecia areata is a disorder related to loss of hair. It is an autoimmune disorder, wherein the immune system attacks the hair follicles and induces hair fall. Alopecia areata causes certain signs and symptoms such as bald patches, sudden loss of hair, excessive hair-fall, and itching on scalp. It leads to different types of alopecia diseases such as alopecia totalis, alopecia semiuniversalis, and alopecia universalis, where an individual suffers from facial to body hair loss.