DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Cold sore on nose. Close-up of a cold sore on the nose of a 49-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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