Hello. I am general dentist working in philly. I have this patient who had a soreness on the max. arch where intaglio surface of max. RPD meets (upper left front areas). The patient said that it has been going on for about 2 months and he never had used denture during this period (to be exact, he could not due to soreness.) He is very sensitive like jumping when I try to touch it. X-ray does not show any abnormality (no tooth piece left). Clinically, just a little bit of redness around that area. (no intraoral swelling at all). Pt asked me if this could be a sign of oral cancer. What would you do and tell pt in this case? What could be the reason for this soreness in this situation?