Alopecia areata / ઊંદરી Alopecia areata is an autoimmune disease in which person's own immunity acts against own hair and results in loss of hair in form of bald patches. It has many causes from simply idiopathic to associated with other autoimmune diseases like thyroid, diabetes, vitiligo. With progress the patch keeps growing in size as well as development of new patches. We recommend early treatment in alopecia areata for damage control and early regrowth of hair.