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This is a close-up of a herpes simplex lesion of the lower lip on the 2nd day after onset. Also known as a cold sore, this lesion is caused by the contagious herpes simplex virus Type-1 (HSV-1), and should not be confused with a canker sore, which is not contagious. The HSV-1 virus remains in the body throughout an exposed persons entire life.
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