With cancers it seems that anything is possilbe. Given your previous experience, I would not let this be something that you just watch. In your shoes I would head for my doctor and have it biopsied as soon as possible. Hopefully it is nothing, but if it is something bad you want to know at the earliest possible time. Please get it checked out by someone that you trust.

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.