Can oral ulcers be transmitted to others?
Common recurrent aphthous ulcers are non-contagious; they are associated with immune dysfunction, irregular sleep patterns, and local trauma, and are not caused by pathogenic infections. In contrast, oral lesions caused by herpesviruses are contagious. If an oral ulcer fails to heal over an extended period or continues to increase in size, prompt medical evaluation is necessary to rule out other oral pathologies.
Sep 03, 2026

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