So I've been sleeping with my gf for about 5 months now, mostly unprotected. Last February we both got checked for STD's, and were totally negative. Since then, we had one falling out, where we each made out with ONE person, ONE time. No sexual acts whatsoever, just kissing. Both had no s/s of STD's. Back to now, 5 months later. We had sex the other night, and she had had a tampon in, so she was really dry. The sex hurt. Now, there's a spot on the left side of my shaft that has little ulcerations. Two open and healing, and now 2 more little red bumps. They appear to be localized in the area that hurt worst during sex. My question is, could this be latent herpes from one of the people we kissed? I mean after 5 months would it just pop up? I don't have swollen lymph nodes, flu symptoms, etc., and this is the first time I've ever had bumps/sores on my penis. Could it be an STD, or does this follow more of a friction blister sort of story? Please help :-(