I have just recenty had unprotected sex for the first time with someone who had sex once before with someone she totaly knew. Almost positive both are clean. After having sex with her about 3 weeks later i've noticed a small, red, painless bump on the shaft of my penis. its probably only 2 millimeter long, 2 millimeters wide. It does not pop or bleed. I have no other symptoms. Im only 17 and Im scared to death. Please help me.