A canker sore and could be brought on by stress and or dietary changes. These are also a form of herpes and will sometimes recur usually in the same spot.
Answer .
Just wanted to add that stress...
Mouth ulcers wich should clear with bonjela, a cream for the mouth. An abcess which is like a tooth infection but can spread. Do you smoke? This could be some form of cancer. You should see your...
Autoimmune diseases like Lupus can also cause blisters inside the mouth. Irritation can also cause them. Often rinsing with a salt water solution will help them heal, as the salt causes the tiny...