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First, you’re not alone. Up to 80% of American adults have the herpes simplex virus (HSV-1), which can cause cold sores (also known as fever blisters), according to Johns Hopkins. The viral infection ...

Add Yahoo as a preferred source to see more of our stories on Google. If you’ve ever had a cold sore, you're familiar with the first hint of trouble. A tingling signals an unwelcome visitor is about ...