My Dear Welcome to Healthcaremagic! I have analyzed your problem and feel that it is really bothersome fora teenager to have such an embarrassing condition. To me it appears that there have been some missing pieces of information in your account related to the size and location, demarcation, and pattern of hair loss bur based on your description I feel that you are most likely having Alopecia Areata. For my patients who attend in person, i usually esquire about the history of allergies (atopy) in the family, symptoms, examination of few hairs plucked from the margins of lesions and family history apart from the scrapings from scalp skin. Then, when the diagnosis of AA is established I put them on Folica for few weeks, to be supplemented with steroids locally, intralesionally if necessary either through a delicate needle-syringe or by dermaroller. That works in more than 95% cases while others may need systemic steroids. I am sure your condition can be managed somewhat on the above lines with great results as uypu are young and more likely to respond favorably. Our best wishes!