Hello i have a reddish, pink swollen and semi -painful bump on the inside of my mouth near the middle to upper part of the inside of my cheek. cancer?

Need more info: It depends on how long has it been there that you know off? If it is increasing in size and has been there for more than 2-3 weeks, then you need to go see a doctor to get it checked out. It is quite common to have canker sores in the mouth but they heal within 10-15 days with or without treatment. Anything that does not heal in 3-4 weeks is suspect for cancer.