Most people do not see a doctor for canker sores and take care of themselves. This is very good.

However, for people who have frequent recurrences of canker sores (a minority), a medical examination and a blood test are necessary. This makes it possible to look for another disease which could cause canker sores, such as those mentioned in this document (Crohn’s disease, Behçet’s disease, etc.).

In addition, in cases of rebellious and persistent ulcerations which could be anything other than a simple mouth ulcer, a biopsy should be performed. Fortunately, this rarely happens.

D^r Dominic Larose, MD