Hours to weeks: Longer if a dry surface. You are contagious when you have a sore on your face. But you are also contagious a few days a month when you have no symptoms at all. Since most people already have the virus hsv1, it has no effect on them. Prescription pills are very effective if used correctly, and very safe. Most people who harbor the virus require no treatment since they have no symptoms.
Answered 6/25/2018
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