Sounds like herpes to me. Had an outbreak once. I got it not knowing it. He used to get coldsores quite often. He went down on me one night (with no signs of an outbreak) and **WALA** I got it, because the virus is in your blood. More than likely I had a cut of some sort down there and the virus got in! To reasure you, this was 3 years ago, have not had an outbreak since, and not on medication.