Sir, it might be stress ulcer, you need to take multi vitamine supplements to help in healing . And as a local application can you quadra gel. And visit a dentist near by to diagnose if there is any local irritant like sharp tooth . And if you are a smoker please don't smoke when you have oral ulcers its affects on healing
Next Steps
visit a near by dentist
Health Tips
do not smoke while having mouth ulcers