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What is this hard bump in my mouth?

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I have this hard bump on the back of my mouth, I'm scared. It's between my wisdom teeth and my cheek, I have no idea what it could be. It's not like a pimple or something that can be popped because it's hard. It hurts to chew, and hurts to talk. I tried some teeth whitening kit and ever since I tried it this bump appeared. I'm scared it might be serious and I cant see a dentist till Oct.6th! What can I do? :(