I have a hard painful lump on my upper, cheek side, gum. It is about 4 teeth wide and almost all the way up. It doesn't hurt all the time but mostly when I chew. It also has a littler color than the rest of my mouth. I have never really had any problems with my teeth before but once had a filling about 5 years ago. I'm not sure if it is something serious and worth consulting my dentist about.