Cold sore. Close-up of a cold sore on the lip of a 7-month-old baby girl. Cold sores are painful, fluid-filled blisters caused by infection with the h


Cold sore. Close-up of a cold sore on the lip of a 7-month-old baby girl. Cold sores are painful, fluid-filled blisters caused by infection with the herpes simplex virus. The infection is contagious and spread by direct contact with the blisters or their fluid. There are two types of herpes simplex virus; HSV1 (seen here), which causes infections of the nose, mouth and face, and HSV2, which infects the genitals. There is no cure for herpes simplex infection, but outbreaks can be treated with antiviral drugs.


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