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Cold Sores 1*
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 personís entire life.
Herpes Labialis, Herpes Simplex, DNA Virus Infections, Herpesviridae Infections
Picture & text from CDC/PHIL. For more information see Cold Sores Pictures from CDC.