DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Aphthous ulcer. Close-up of an aphthous ulcer on the tongue of a 95-year-old female patient. Aphthous ulcers usually occur on the mucous membrane inside the mouth, causing pain and lasting up to two weeks. In this case the ulcer was caused by a sharp tooth.
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