Good afternoon Dear Thanks for the query It's very difficult to comment regarding precancerous lessons without examination of that area. To me it seems more of Apthous  Ulcers..which usually occur when person is under stress or not well physically. Stop taking all medications just apply Dologel on ulcers , Have plenty of water  and avoid taking citrus as well as spicy food. And do brush your teeth gently don't ignore otherwise the severity of pain or discomfort will increase. Regards Dr. Aman Bhatia Chandigarh www.dentafix.in