Dude, I've got a pink circular scar the size of a #2 pencil eraser on the top of my dick from wacking it so much. I was 17 and had a good jack session with no lube, and it got chaffed. I tried to lay off the sucker but I couldn't for very long, and the scab kept getting torn off. Now I have a damn scar.
Too much info? Naaaah...