I had protected sex with a girl who I believe was std free and about 2 days later a red bump appeared on the shaft of my penis. Its not very painful unless I push down on it, almost like a zit on your face. It was the first time I had sex in about 7 months so I didn't know if it was a reaction to wearing a condom again. I pan on getting it checked out tomorrow, but I was wondering if this has happened to anyone else.