Open Question: a painful cut or what ever near the lips but inside the mouth?

It is like a skin ripped off or something surrounded with a very small white circle then a big red hurts when I drink/ear anything that contains some fats/oil or if I touch it with my mouth...I can't eat from this stuff...I did have many of these before they just go away fast, but eh...I dunno...I heard about the HPV stuff, but no way, I am still a virgin lol...and I guess there is another one popping in my mouth now...what is that thing??!