Talk to Dermatologist on Facial Hair

How many sessions are needed for a successful treatment of facial hair with laser? And does it even work without any drug treating the underlying cause? I’m a medical student myself and i have had an unsuccessful treatment comprising of six sessions. I think I’m doing worse than before. Moreover my skin is starting to look bad because of the alternative methods I’ve used. I want to take the ultimate treatment but I’m not sure about the results.