Hi, i agree with Healthnut on this one. The pill can be pretty bad - contains a fair bit of progesterone (male hormones; hence the moustache). I no longer take the pill, but was on it for at least a year until i realised i was continually premenstrual. I have also noticed dark hairs in the wrong places... face, neck, breasts.
Another theory is a dysfunctional liver causes excess facial hair. Does your girlfriends diet contain too much alcohol or fat? Also, asian genes are not known to be to compatible with alcohol.
Good luck with the research!