About once or so a year I get this red, sore bump on my lip. I've never had sex, and I've only kissed 2 people (neither of which had anything on their mouths). I looked up pictures of herpes cold sores (just because I am a little paranoid) and my bump doesn't look like them... it's just looks like small pimple on my mouth. It's really embarassing - any ideas at all would be appreciated.