The best bet is to go see your local doctor and get a medical professional to look at your sore.

Usually, they advise you go see the doc / dentist if a mouth sore is around for over 2 weeks and does not go away in which case, I would wait and see rather than jumping to different conclusions!

As per above, make sure to go see a medical professional as everyone is different and only a medical professional will be able to provide you the correct diagnosis.

6/8/12: Wife 33y/o with no risk dx with Stage IVa SCC L of Tongue(T4aN2bM0)
3/9/12: Induced birth @ 36 weeks - Baby Hunter!
11/9/12: OP - 3/4 Partial Gloss, Radical ND & Tongue Rec.
24/10/12: 33xRad + 7xChemo
7/12/12: Tx complete
21/3/13 & 21/6/13: NED
24/7/13: SCC in Lungs - OP: Lobectomy (VATS)
29/1/14 passed away