Fever Blisters, Cold Sores, and You

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Fever blisters, or cold sores, erupt on the outside of the mouth and are caused by a virus–the herpes simplex virus (HSV-1 or HSV-2). This highly contagious blister often lets you know it is coming, by tingling or burning before showing up as a fluid-filled blister which oozes fluid and then crusts over.  It is… Read more »