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An ulcer is a sore on the skin or a mucous membrane. There are several types of ulcers caused by a variety of factors. Some of the most common include ulcers that form in the lining of the stomach or intestine.


Canker sores (mouth ulcers)

A canker sore is a shallow, crater-shaped sore that develops on the tongue or on the inside of the lip or cheek. It usually has a red border and a white or yellowish centre. A canker sore can be small or large in size (> 1 cm), and there may be more than one sore at a time.
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