Hi Cherry!
Welcome to OCF, sorry to hear you are having health concerns. Just to be clear, where there are Dr's who do check these forums for medical accuracy, they do not comment even though we do have a few medical professionals on these forums. That being said, I'll offer my opinion.
You've identified a concern in your mouth and have contacted a medical professional to have it checked out, which is "exactly" what you should do. For peace of mind you'll want the area biopsied as that is the only way to confirm cancer, that is the first step really.
We have a saying on these boards, that it's NOT cancer until a biopsy says it is, so where this is troubling don't let it take over your mind and freak out. We could do the "what if" game and speculate all day long on what it could be, which it could be a number of different things and not cancer. Let's spare you the mind freak and the other forum members time and let the medical professionals get to the bottom of the mystery.
Now normally the way it works is a dentist will identify an area of concern and send you to an Oral Surgeon or Ear Nose and Throat Dr to have the area biopsied. They will then send the sample to a pathologist who will confirm or deny cancer. Start there, and try to take one step at a time...getting too far ahead will only cause undo stress and worry. Just make sure to communicate how important for peace of mind a biopsy is for you.
Hope that helps, keep calm and just take the steps above. Let us know what the results are and we'll go from there.
Keep your chin up, again, don't let fear and worry take over.

Eric