A mouth sore is enough to make your appetite go for a toss, right? Canker sores are painful sores that usually appear inside your mouth, at the base of your gums. While these are not contagious, they ...
Pull your upper lip upwards and bottom lip downwards to look inside the mouth for any sores or changes in color. Use your thumb and forefinger to feel around your lips for any lumps or bumps.
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