DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Cold sore lesion (orange) on the lower lip of a 50-year-old man. Cold sores are caused by the Herpes simplex virus, and are painful skin blisters. Anti-viral medication such as aciclovir can reduce the severity of the symptoms.
Model release available. Property release not required.