If there is a non healing ulcer associated with it, then perhaps it has progressed to oral cancer. You need to visit a dentist for sure. Timely visit can save life!
Next Steps
visit a specialist dentist who is adept in taking a biopsy if needed. mostly you will be helped by an oral surgeon or an oral medicine specialist.
Health Tips
timely confirmation of your lesion can save you money, save you aggressive surgery and may prove to be life saving.