Mouth ulcer
Mouth ulcers are common and can usually be managed at home, without seeing your dentist or GP.
cheeks
lips
tongue
They can be white, red, yellow or grey in colour and swollen.
You may have more than one mouth ulcer at a time and they may spread or grow.
Mouth ulcers shouldn’t be confused with cold sores, which are small blisters that develop on the lips or around the mouth. Cold sores often begin with a tingling, itching or burning sensation around your mouth.