Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern...
As per your complain you might have following problems
1. Ulcer or cancer sores with inflammation
2. Traumatic ulcer due to hard brushing
3. It might be result of viral infection such as herpes
4. Rarely it might be an
abscess or cyst
You can do following remedies:-
Apply numbing gel containing Lignocaine for relief..
Do warm saline gargles..
Gargle with 1:1 solution of betadine
Consult an oral physician, If problem persist and get evaluated
Don't worry you would be fine
Hoping your query is solved.