... inside of mouth. There is not much( if not any) pain. My (same side) sinus and upper cheek area are actually tender.This little irritation/pain is new symptom. I have been hesitant to see a Doc or Dentist cause during Feb., I would have a cheek swell up,but EVERY time I finally gave into seeing someone, the swelling would COMPLETELY DISAPPEAR! Literally gone like never existed.But it's back again so i need to Get a second opinion and make sure it's not something potentially serious/threat! Thank u for your conments