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![Canker sore: MedlinePlus Medical Encyclopedia](https://www.iarticlesnet.com/pub/img/site/s_50.jpeg)
Canker sore: MedlinePlus Medical Encyclopedia
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日期:2024-07-19
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)....看更多