Canker Sores
Definition
Canker sores (aphthous ulcers) are small shallow sores or ulcers that appear inside the lips, inside the cheeks, or on the gums. They begin as small, reddish swellings. Then they burst, and the rupture sores are covered with a white or yellow membrane. The edges of the sores are still red and look like a painful red halo. Without treatment, canker sores heal in two weeks or less.
Description
Canker sores occur inside the mouth, usually inside the lips, cheeks, or soft palate. They can also occur on or under the tongue and in the throat. Often, several canker sores appear at the same time and may be inclusters. Canker sores appear as a whitish, round area with a red border. The sores are painful and sensitive to touch. The average canker sore is about 0.25 inch (0.6 cm) in size,...
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