Minoxidil has been authorized by the Food and Drug Administration (FDA) to treat hair loss. It is the only hair regrowth product that is suitable for both men and women. Minoxidil may be used with another therapy by a dermatologist. This combination treatment is more effective at promoting hair growth. Dermatologists are physicians who specialize in diagnosing and treating diseases, abnormal conditions, and medical mistakes called lesions. Physicians who specialize in dermatology care for the skin, including its cancerous tumors and pre-cancerous changes. They may also diagnose other illnesses or injuries related to the skin. A dermatologist should be listed on any medication prescribed for your hair loss. Hair loss is a very common problem with many causes. Only one of these causes is usually medically recognized: alopecia. There are two main types of alopecia: male pattern baldness and female pattern baldness. Both types of alopecia are caused by changes in hormones or hormone levels, which affect how fast hair grows in scalp. Hormone changes can be due to age, stress, illness, or medications. Hair loss is also caused by genetic factors, coloration of hair, and problems with the scalp skin. These causes of hair loss are not medically recognized because there are too many variables involved for doctors to identify specific reasons for individual cases of hair loss.