little bump, inflamation in the mouth

I had a similar one the other night just to the left of this one and it went away after I drank some water.

My dad looked at it and he said it didn't look like a chancre sore at all, just a small little swollen area.

I have a great deal of anxiety and I have also been drinking soft drinks lately (like Pepsi, Dr Pepper) ...I wonder if this has something to do with it???

I brush my teeth regularly and gargle with Listerine quite often...

Has anybody else ever had this happen?

Could it be allergies? related to the Soda pop or the Listerine?

I want to know so I can start eliminating possibl causes...

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