Bright Red Sore at Top Pallet in Mouth

Patient: I have a sore in my mouth that has come back three times. It is a large bright red sore at the top pallet of my mouth It is very sore and no cannot eat anything unless it is soft and not saltyy. I have taken two pictures and today it seems worse than yesterday. I have tried gurgling saltwater and gargling with mohydrogen peroxide and water mix

Doctor: