Welcome to OCF! Hopefully you will not need our site but if you do we will be here to help.
Around here we have a saying...
Any sore that does not resolve itself within 2-3 weeks should be checked by a professional. By a professional I mean an ENT who specializes in treating oral cancer patients. There are all kinds of things that come and go in a persons mouth, a sore could be many different things besides cancer. OC patients often do not experience symptoms until the cancer is in its later stages. Hopefully what you have going on is nothing serious.
OCF has partnered with many dental professionals across the US who offer free screenings. Maybe one of these places (or events) is near you? Try calling your insurance company too, they should have a directory of specialists and be able to direct you in the right direction.
Oral Cancer Free Screenings Good luck!!!