I recently had protected sex with a lady I don't know too well. About 2 or 3 days later, I got 1 bump right under the head of my penis. The bump is under my foreskin. The skin over the bump isn't red, irritated, and it doesn't hurt. Do you know what the bump could be. The bump is kind of soft when my penis isn't erect, and the bump gets kind of hard when my penis is erect. About 2 days after I had sex with her, I was masturbating, and all of a sudden, my penis started hurting, right under the head of my penis, where my bump now is. The next day I had a bump there.