I found this red spot on my scrotum this morning, it's red, and very painful when it is touched; say walking and boxers rub against it. It's right like, on the front pretty much, where your boxers touch. It's about the size of a dime.

I'm 17. Yes, I am sexually active. No condom. But she has been tested with me, and we are both clean. Do not give me anything about that. I want to know about what the hell this painful red spot is.