Re: painful,annoying bump or sore in left cheek
If you bit the side of your mouth hard enough, you have a small cut in the mucous membrane. These usually go away completely in a few days. ALL mouth cuts like that get small infections in them because of the normal bacteria present and will make them hurt for a few days.
It should be gone by tomorrow or the next day. Try not to eat on that side of the mouth and rinse with warm salt water (1/4 tsp in 8oz water) a few times a day to help it heal faster.
GOOD LUCK, but it should be gone by the New Year. Have a Happy!
My best to you,