Merck Manual

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Cold Sore
1573_herpes_labialis_lip_public_health_image_library_high-CV
Cold Sore

    This person has a cold sore on the lower lip caused by herpes simplex virus type 1 (HSV-1). The sore consists of several fluid-filled blisters surrounded by a reddish rim.

Image courtesy of Dr. Herrmann via the Public Health Image Library of the Centers for Disease Control and Prevention.