ISM / SCIENCE PHOTO LIBRARY ISM / SCIENCE PHOTO LIBRARY
Close-up of an aphthous ulcer on the inside of the lip of a young male patient. This large whitish ulcer is surrounded by red inflamed tissue. Aphthous ulcers usually occur on the mucous membrane inside the mouth, cause pain, last up to two weeks, and may be caused by a toothbrushing injury.
Model release not required. Property release not required.