An autoimmune, often reversible disease in which occurs in sharply defined areas.
Part of: ,
About Alopecia Areata
areata is considered an , in which the , which is designed to protect the body from foreign invaders such as and , mistakenly attacks the , the structures from which hairs grow. This can lead to on the scalp and elsewhere.
In most cases, hair falls out in small, round patches about the size of a quarter. In many cases, the disease does not extend beyond a few bare patches. In some people, is more extensive. Although uncommon, the disease can progress to cause total on the scalp (referred to as ) or complete loss of hair on the scalp, face, and body ().
What Causes It?
In areata, called the rapidly growing cells in the . The affected hair follicles become small and drastically slow down hair production. Fortunately, the that continuously supply the with new cells do not seem to be targeted. So the follicle always has the potential to regrow hair….