Mouth ulcers

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Canker sore (aphthous ulcer)

Lichen planus on the oral mucosa

Mouth sores

Oral thrush

Oral ulcer; Stomatitis - ulcerative; Ulcer - mouth

• Pain or discomfort in the mouth
• Presence of open sores in the mouth

A health care provider or dentist usually diagnoses the type of mouth ulcer, based on the appearance and location of the lesion. Blood tests or a skin biopsy of the ulcer may be needed to confirm the cause of the problem.

Review Date: 01/18/2007
Reviewed By: Benjamin W. Van Voorhees, MD, MPH, Assistant Professor of Medicine and Pediatrics, The University of Chicago, Chicago, IL. Review provided by VeriMed Healthcare Network.