Cold sores. Close-up of cold sores on the lips of a 54-year-old woman. Cold sores (oral herpes, herpes labialis) are caused by infection with the Herp

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Cold sores. Close-up of cold sores on the lips of a 54-year-old woman. Cold sores (oral herpes, herpes labialis) are caused by infection with the Herpes simplex virus. They primarily affect the lips but can occur anywhere on the body. The cause is usually herpes simplex virus type 1 (HSV-1).

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Photo credit: © DR P. MARAZZI/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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