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Canker Sores

Are canker sores the same thing as cold sores (fever blisters)?

No, canker sores are not the same thing as fever blisters (cold sores).

Canker sores occur inside the mouth and are not contagious. Fever blisters are infections caused by the herpes simplex virus (HSV), they mostly occur on the lips and outside of the mouth, and they are very contagious.

Reviewed on 10/10/2016
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