Yes, that is a real risk, specifically for women with hormonal imbalances like PCOS, and specifically on the face. The heat from the laser can sometimes stimulate dormant vellus hairs (peach fuzz) into becoming terminal hairs (thick, dark). However, this is rare with modern lasers and experienced techs. For facial hair, you need a very specific setting. Many clinics recommend electrolysis for PCOS faces, but if you do laser, they must use a lower fluence. Do not let them blast your face like they would your legs. I strongly suggest a patch test on a small, hidden spot under your chin first. Wait 3 months. If no stimulation occurs, proceed. But proceed with caution.