Hi, I'm 15 years old. Almost a year ago i engaged in some sexual activity but I used a condomn. Today i noticed a small bumb on the underside of my penis near the head. It has about the diameter of just a tiny bit smaller than a pencil eraser but its not that tall. It's not flat either though. My partner and I were both virgins before we had sex and she said she didn't have anything. I know I didn't have anything before, but I'm really scared now. Please help.