If you have a small crater-like ulcer inside your mouth, perhaps on the inside of your cheek or lip or on your tongue, it is probably a canker sore. These painful ulcers, also known as aphthous ulcers, typically have a red border and a whitish or yellowish center. While harmless, they can certainly make your life miserable until they go away.Unlike cold sores, these pesky ulcers are not
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