I have a red bump on my penis. It started out about three weeks ago or so as a flesh colored bump. It is a single bump and doesn't look like anything i have seen concerning herpes. it is red now because I was messing with it all day yesterday. It doesn't hurt, hasn't popped on it's own, and isn't in a cluster or anything like that. the last time I had sex was six months ago... I don't know what this could be. please help