Alopecia areata, conjointly called spot depilation, is associate disease within which hair is lost from some or all areas of the body, typically from the scalp as a result of the body's failure to acknowledge its own body cells and sequent destruction of its own tissue. typically it leads to bald spots on the scalp, particularly within the initialstages. In 1–2% of cases, the condition will unfold to the complete scalp (alopecia totalis) or to the complete skin (alopecia universalis).
There are 2 types: scarring baldness, wherever there's pathology, inflammation, and loss of hair follicles, and nonscarring baldness, wherever the hair shafts are gone however the hair follicles are preserved, creating this sort of baldness reversible. Conditions resembling alopecia, and having an identical cause, occur conjointly in differentspecies.