Definition
Labels Canker Sores
Canker sores are small ulcers inside the mouth that are white or grayish
with red borders. They are not contagious. Canker sores should not be
confused with cold sores, which occur outside the mouth around the lips,
are caused by a virus, and are very contagious.
with red borders. They are not contagious. Canker sores should not be
confused with cold sores, which occur outside the mouth around the lips,
are caused by a virus, and are very contagious.

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