I’ve had this on and off for a while - I made a dentist app last week and he didn’t seem concerned. It isn’t sore most of the time (occasionally feels like an ulcer) but doesn’t heal. I’m about to go away for two weeks and I’m worried about it. It is likely to be an abscess? The dentist didn’t do any X-rays, just tapped on the teeth etc and when there was no pain didn’t seem unduly concerned.
sorry for the photo!