A canker sore, or aphthous ulcers as they may also be recognized as, are little painful sores that kind to the inside of your lips, cheeks, and also in your tongue.
Don't confuse a canker sore having a fever blister or a cold sore, that is a virus and types to the outside of the mouth in most all cases. As opposed to cold sores which is the herpes virus, a canker sore is really a bacterial infection, and never contagious.
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