DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Canker sore. Close-up of a large aphthous ulcer (canker sore) in the mouth of a 19-year-old male patient. Aphthous ulcers are non-contagious mouth ulcers (aphthae) that appear on the inside of the mouth, especially the cheeks (as here), the inside of the lips, and the tongue. They usually disappear within 14 days and don't scar unless they are large. They often occur near the time of a menstrual period, in stressful situations, with a lack of vitamin B12, folic acid, or iron.
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