I would be...: Aphthous stomatitis involving common canker sores can occur in up to 15% of americans, & may involve some bacteria like staph epidermidis. However, similar-appearing aphthous ulcers can be seen with herpes, crohn's disease, & other systemic disorders (Behcet's). But if you have multiple aphthous ulcers or frequently recurring ones, please have the lesions (& possible underlying cause) checked out.
Answered 2/4/2015
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