I'm 18, I've been masturbating for about 2 years now. A few months back, after I got finished masturbating I got an annoying tingling feeling on the underside of my penis. the feeling gave me an extremely strong urge to masturbate again but I resisted. this feeling carried on for a few days until I went to the doctor thinking it was a tract infection. But she said there was no sign of infection, and by that point the feeling was gone. But now, 4 days ago I got that feeling again, I haven't masturbated since, that urge/feeling is extremely annoying and it interrupts my ability to focus. Some things to note are I was masturbating about 4 times a week and I used cloth items to masturbate with, not my hand. I also used Vaseline as a lube but not very often, maybe once a week. Something else to note is that there is a red spot a large section of red skin where tingling spot is. Any ideas on what this is and how I can get it to stop? Any answers would be much appreciated.