Pollack says they look like blisters – red, raised, and painful bumps. They typically occur outside of the mouth on and around the lips, but it is possible for them to occur on your tongue ...

Canker sores, or aphthous ulcers, are white or yellow sores that can develop on the tongue or inside the lips or cheeks. They can be painful. Most canker sores go away on their own, but some may ...