wowzers

i have a large pimple-like sore in my mouth. it's on the side of my mouth just near my top right rear molar. it's very weird, sort of like a growth of the gum. it almost looks like part of the skin/gum (inside of the cheek) got cut away, got swollen up, and is now dangling and has a white head that looks like a small canker sore on it. i don't think anything was cut though, as it really doesn't hurt.

i'm not sexually active but i did kiss someone i didn't know too well recently, and was told mouth herpes can spread. just don't know if that's a sign at all? i have never seen anything like this and i have no sores on the outside of my lips neither do i have any more of these lesions in my mouth nor have i ever had anything like this.