What is Mouth Ulcers? Ulcers are really common, rearing their ugly heads when you’re tired or stressed. In most cases, they clear up in a few days, but if you find one that’s sticking around and shows no sign of healing it might be worth seeing a GP
An ulcer that won’t heal is one of the red-flag warning signs of mouth cancer or cancer that develops in the lining of the mouth.
If you have mouth cancer you may also develop unexplained lumps in the mouth and neck, numbness or tingling around the lips and tongue or even a change in speech like a lisp.