Red Sores On Skin On Whole Body

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Definition

A canker sore is a painful, open sore in the mouth. Canker sores are white or yellow and surrounded by a bright red area. They are not cancerous.

A canker sore is not the same as a fever blister (cold sore).


Alternative Names

Aphthous ulcer; Ulcer - aphthous


Causes, incidence, and risk factors

Canker sores are a common form of mouth ulcer. They may occur with viral infections. In some cases, the cause cannot be determined.

Canker sores may also be linked to problems with the body's immune...

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