Re: Chronic mouth ulcers and sores means oral cancer?
To me it sounds like Oral Lichen Planus, which can be relieved by a mouthwash your dentist can prescribe for you. If you do an online search, you can find symptoms and pictures that will probably look very close to what you're experiencing. There are varying degrees of intensity of this, from simple discomfort and tenderness on occassion, to actual sores like you're experiencing. The fact that they're coming and going tells me it's not cancer as cancer doesn't go away. And lower cheek is a prime spot for Lichen Planus to pop up. You mention pizza irritates it - that would be the acid from the sauce, as tomatoes and tomato products are well-known irritants for this disorder. It's not something that can be 'cured' but it can be controlled by a mouthwash when you feel the irritation coming on. Let your dentist have a look at it just to verify that's what it is, and he'll also give you a prescription for the mouthwash to use a couple times a day to not only clear it up, but will make it feel a whole lot better.