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I agree with xMSx, it's most likely a canker sore. I've had a few on my gums and they're a lot worse than the ones you get on your lip or cheek. I always use Listerine to disinfect the area, and from my own experience it has always helped it heal more quickly. Do you remember if you could have accidentally cut your gum? Cause I've noticed that I'll get a canker sore if I accidentally bite my lip or something.
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one pill makes you larger, one pill makes you small, and the one that mother gives you, doesnt do anything at all Feed Your Head 
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