Hi , so about a month back I broke part of my tooth at the top of my mouth right at the back , it caused an ulcer directly across from it on my cheek that was very painful now the pain is away I still have the ulcer it's got a white edge it's round painless I'm just looking for some advice I have health anxiety so my first thought is oh no it's cancer but could I possibly be a scar from the ulcer ? Any help/advice would be great as I'm beginning to worry myself sick