I have this deep cavity in my very back tooth. It doesn't really give me pain anymore but I've been on the waiting list for a long time now to get into the dentist. For a few days now, there's been this bump kinda thing attached to my gums right by the tooth with the cavity. Its more like a sack on a string kinda. Like there's this bit of my gum that's attached to then there's a bump at the end of it. I pushed on it a bit and some light colored blood came out twice but that's it. I don't understand what it is and I'd like to know.