What is Alopecia?
There are many forms of alopecia, each resulting in hair loss. Alopecia areata is a type of hair loss that occurs when your immune system erroneously attacks hair follicles, where hair growth starts. The follicle damage is not usually permanent. Alopecia areata is most common in people under the age of 20, but it may affect children and adults of any age. Equally affected are women and men.