If it was cancer and you've had it for a while, you would be in serious trouble/pain and not just concerned about a small bump. So I wouldn't worry about it too much. There are lots of things that form little hard, benign spots in your mouth. It's probably something that your regular dentist can look at and put your mind to rest about.

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.