Re: Canker sore not going away
I've had many canker sores over the last few years. Canker sore is EXTREMELY painful and it has that characteristic appearance (google the pics). Mine always went away within 10 days or so.
From what you describe, it doesn't sound like a canker sore. But it doesn't have to be cancer either. It could be, for example, oral lichen planus. Or other numerous benign oral conditions. Did you see a dentist yet? If it is still there after 3 weeks, I suggest that you should. NOT to rule out cancer but rather see if this is something else that could be treated.
__________________
Life begins at the end of your comfort zone.