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Cold sores (herpes labialis)
Cold sores are caused by herpes simplex virus 1. Unsightly and unpleasant, they come back periodically because the virus remains in the body for life.

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Labial herpes

Labial herpes is caused by the herpes zoster virus. Approximately 80–90% of the population carries and is infected by this virus, and many don’t know it and never present symptoms.
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