Can Canker Sores Spread Inside Your Mouth. Canker sores are common and often recur. Learn more and Fix the Problem right.
Canker sores are usually small, relatively shallow ulcers found inside the mouth (not to be confused with viral-based cold sores that erupt on or around lips).
A canker sore can't be spread from person to person or within your mouth.
In the beginning stages, the sores may appear as small red dots. The exact cause is unknown but they are not contagious. The defining difference between canker sores and mouth cancer is pain. Usually, canker sores are caused by a vitamin deficiency. It mostly happened to me when I was wearing braces and retainers. You might notice a tingling or burning sensation a day or two before the sores actually appear.
Strain over the soft tissue or mouth injury can also result in the development of the canker sores. When you're trying to figure out whether you have a canker sore or a cold sore, check if the sore is inside or outside the mouth. It may help to remember that canker sores occur inside the mouth, while cold sores usually occur outside the mouth. They typically have a white, gray, or yellowish film with a red border. Canker sores also look different than patchy mouth cancer. Canker sores are common and often recur.
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A canker sore looks like an ulcer or sore. The defining difference between canker sores and mouth cancer is pain. This is one factor that helps you to know that it's not cancer, because cancer sores in these locations are generally not painful, just persistent.