I have what appears to be a mouth sore on

Patient : I have what appears to be a mouth sore on the roof of my mouth but I'm sure its been more then just a week or two (the average time for a mouth sore to go away) is there any way I can rule out cancer without going to the doctors office?
Symptoms:  Sore on the roof of mouth. Also I don't know if its related but I have been having some joint pain and discoloration in my knuckles.
Doctor :   This question is currently in queue and will be answered shortly by one of our doctors. In the meantime you may browse our library of answered questions by clicking here.

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