The term means loss of hair and alopecia has many causes and patterns. One convenient division is into localized and diffuse types. It is also important to decide whether or not the hair follicles have been replaced by scar tissue; if they have, regrowth cannot occur. The presence of any disease of the skin itself should also be noted.
Some of the most common types are listed in Table
This affects about 2% of the patients seen at our skin clinics.