A few possibilities:: There are a number of conditions that can cause blisters in the mouth, including thermal injury, viral infection, and a range of "vesiculo-bullous" disorders. Persistent oral blistering should be assessed by a clinical oral pathologist. If you're located in the United States, you can find contact information for an oral pathologist at: http://www.Aaomp.Org/find-an-omp/clinical-services.Php?Php.
Answered 9/28/2016
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