Alopecia refers to hair loss in areas of skin that normally have hair. There are two forms of alopecia scarring and non-scarring.
Scarring is the loss of hair follicles. This form causes permanent hair loss. The most prevalent forms of scarring alopecia are:
In the case of non-scarring, the hair shaft is gone, but the follicles are still present. It often is reversible. It can also develop into the scarring type. Non-scarring types include: