Canker sores and oral cancer lesions may seem similar but there are ways to tell the difference. A lesion that's red, typically flat, and painful early on is usually a canker sore (aphthous ulcer).

Canker sores are painful ulcers that form inside your mouth. The sores can affect daily habits like eating and drinking. Experts recommend key practices like regular teeth brushing and flossing to ...

If you have painful, white and red spots in your mouth, you may have canker sores, but what can you do about them? The ulcers are typically small and painful and can affect eating and drinking, ...