How can i cure my cranker sore its inside my mouth on my gums but i only have one it really hurts wat can i pu

its a red spot dat is like a hole in front of my bottom teeth i think i ate sumthing really hot that burned me in my mouth i need help it really hurts i b putting on zilactin on it but thats just a pain reliever i need a cure.i cant eat,drink,or even brush my bottom teeth fast cuz it hurts alot i cant even smile