Aphthous ulcers, more often known as canker sores, are small, painful sores that can appear on the gums, inner cheeks, tongue, and roof of the mouth. Cold sores, which are also caused by the herpes virus but more commonly appear on the lips or outside of the mouth, are not the same thing.
- Canker sores typically have a red border and a round or oval shape. They come in a wide range of sizes and can cause a lot of discomfort, especially while trying...