DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Aphthous ulcer. Close-up of an aphthous ulcer (mouth ulcer) on the inside of patient's lower lip. The large whitish ulcer is surrounded by red inflamed tissue. Aphthous ulcers usually occur on the mucous membrane inside a cheek or lip. The small painful sores last up to two weeks before disappearing. The cause of aphthous ulcers is not understood, although they may be triggered by injury (by a toothbrush, for instance), and are known to sometimes contain streptococcus bacteria. Treatment is palliative, consisting mainly of soothing ointments and painkillers.
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