Hi doc im 17 and me and my gf have

Patient: Hi doc im 17 and me and my gf have done oral a couple of times but just 2days ago I’ve done it and red spots appeared and today they’re some what gone but yesterday we did oral again and today as i was shaving I saw a pimple under my penis. We haven’t had sex, just oral. I always tend to masturbate a lot too but stopped when I had the red spots. Im concerned. Is this bad or will this fix by itself and should i stop having oral?

Doctor: