If it's a coldsore, it's a type of herpes virus. Just becareful of it and don't touch anywhere else on your body like your genitals. Otherwise you could give yourself genital herpes and that can be passed onto the baby when you give birth. There are topical creams but you should check with your doc to see if it's okay before using them.
Is it a cold sore? I have always wondered about that too.
I seriously doubt it....it's probably a fever blister or something of the like.