If I were you I would immediately seek the attention of a dentist or physician to diagnose this condition that is impossible for me to evaluate through the email. I am sure your local hospital emergency room can provide a definitive diagnosis and has the requisite back up laboratory, Radiographic and pathology services to provide the treatment you require to remove this painful growth before it has an opportunity to grow.
What causes a painful blister on the top of your mouth? Well lets see... Super hot cheese pizza can do it if you get the cheese stuck to the top of your mouth when you take a really big bite. Did that cause your blister? Did I answer your question quite literally?
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Posted by RastamanT
Just a red painful blister on the roof of the mouth..