I was having protected sex with my girlfriend, in the process, she felt like there was blood dripping out from her vagina, and it dripped some onto the condom, so we had stopped. I don't recall if blood actually got onto my skin. Exactly a week after I had sex for the 2nd time with my girlfriend, I had noticed a small red bump on the area below my stomach, about 1.5" above my penis where in the hairy area. It is about 2mm x 3mm It did not itch, but it will hurt just like a pimple if I really really press on it hard enough, it felt just like a pimple, or even an insect bite. I checked and see if there are any white discharge, but there wasn't any discharge. So I had applied a skin irritation cream that my friends and family use when they have pimple of insect bite. Its called "BETATINA CREAM" the ingredients are, NEOMYCIN, BETAMETHASONE, CLIOQUINOL, TOLNAFTATE. The day after I applied the cream, the redness went away, it went down to about 1mm x 1mm. Two days later, it turned into a circle that look similar to a healed cut with dry red blood on top, I have attached a picture below. It looked about .5mm bigger than before. My guess it would be about 1.5mm x 1.5mm right now. I tried to compare to STD out break out pictures on google image, but did not see any. Could it be some kind of STD that I caught from her? Or could it have me an insect bite from ants or spider?