With the and stress of new tasks in the new year, you might notice a cold sore or two.The tiny blisters, which appear around the mouth, are a sign of the herpes simplex virus, which is contagious and carried by 90 percent of people.It is usually harmless, but in cold wind, hot sun or if you're immunity is low, it can come out in the form of unpleasant cold sores.
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