Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns.
As per your complain it seems like a
canker sore only and as it might have got inflamed it is extremely painful..
As per the location that it is present it can also be due to cheek bite in that area leading to formation of an ulcer..
I would advise you to apply a numbing gel over the ulcer, take
Ibuprofen or
diclofenac for pain, gargle with soda bicarb solution and suck ice..
Avoid hot and spicy food, take
soft diet and drink plenty of water..
Maintain a good
oral hygiene..
In case if it does not improve in a week consult an oral physician and get evaluated and treatment can be done according to the cause..
Hope this informations helps..
Thanks and regards.
Dr.Honey Nandwani Arora..