I have dark friction burn on my penis. I know it's from prone mstrbation, which I've stopped years ago. I've been trying man 1 man oil. Not going away?

See your doctor. It's not likely that friction burns could cause scar that would persist for years, unless the burn was so severe that your pain would have put you in hospital. Without a thorough physical examination, it's really not possible to know what you really have, much less what might help. Hence, I recommend you go see your doctor, and look further into this.