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A member asked:
What causes cold sores?
A doctor has provided 1 answer
HSV1: Cold sores are painful liquid filled blisters that can occur on the lips, roof of the mouth or the gums which are caused by the herpes simplex virus (hsv-1). An estimated 80% of americans have been exposed to herpes simplex virus type 1. However, not all of those people will get cold sores. It depends on your immune system.
Answered 3/31/2014
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