Yellow roughness on both side of cheeks.

So 2 mouth ago, I came accross a small patch on my left side of inner check. As time went by it started growing and it was on both side of my cheeks and it had redness around it which was sour to taste! (Note. I used to constantly touch it with my tongue!) Then I consult a dentist he said it's just a discoloration nothing to worry about. I was still worried so i consulted my family doctor and he gave me Bi-Folate tablets Kenacort to apply on the affected area, D-soft tablet, and told me not to irritate it with my tongue  as time went by it reduced but when i stop applying Kenacort it feels like it is coming back! Note.1 the roughness is excatly below the  upper 3rd last tooth to the left which was remove when I was young. Note;2. I have a upper wisdom tooth to my left side not sure if that's the reason why I have the roughness Note 3. I don't smoke nor i have any other habit. I do drink but occasionally,4. my lips also feel rough kind off maybe because I touch my lips with my tongue