Hair growth in both men and women is regulated by androgens. Testosterone stimulates hair growth in the pubic area and underarms. Dihydrotestosterone stimulates beard hair growth and scalp hair loss.
Hair disorders include alopecia (see Alopecia), hypertrichosis (see No androgen excess), hirsutism (see Hirsutism), and pseudofolliculitis barbae (see Pseudofolliculitis Barbae). Although most hair disorders are not serious, they are often perceived as major cosmetic issues that demand treatment. Dandruff is not a hair disorder but rather a skin disorder (seborrheic dermatitis) of the scalp (see Seborrheic Dermatitis).
Last full review/revision December 2013 by Wendy S. Levinbook, MD
Content last modified January 2014