MSG, I'll side with Brian -- You need to stop worrying about where 'whatever it is' came from and find out what it is (what difference does it make whether it's HPV, cigs, booze, irritation, or little blue men from another galaxy?) -- Deal with it -- Wasting precious time, otherwise.

Were I you, I'd go back to Doc and demand referral to ENT or oral surgeon specializing in cancer diagnosis. Dunno if you are in CA as in Calif, or Canada, but there's plenty of cancer talent in both places, you just need to get to it. We can all sit around the cracker barrel later speculating where it came from after your biopsy reveals what it is.