DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Aphthous ulcer. Close-up of a large aphthous ulcer (canker sore, white, centre) on the palate of a 34-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.
Model release not required. Property release not required.