I am a male, 17 years old. I have a small red bump on the shaft of my penis. its red on the outside and pretty dark black in the middle, with a very small hole in it. I ve tried popping it to see if it was just a zit or something, but I ve never really had a zit so I m not sure, it does sting a bit but aside from that there is very low pain. I am not sexually active, and I do not masturbate often at all. I m quite alarmed as to what could have caused this, please help.