What increases growth of facial hair in women?

Testosterone: Excess facial hair in women is defined by the presence of coarse, dark hair on the lip, chin, chest and sideburn area. It is the result of higher levels of the hormone dihydrotestosterone, a precursor to testosterone. Some levels of testosterone are normal in women, responsible for thick beautiful hair and eyelash growth. Estrogen and testosterone act together to provide normal hormonal balance.