Merck Manual

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Mouth Sores in Herpes Simplex Virus Infection
Mouth Sore in Herpes Simplex Virus Infection
Mouth Sores in Herpes Simplex Virus Infection

This close-up of a newborn's mouth shows sores on and under the upper lip caused by herpes simplex virus.

DR P. MARAZZI/SCIENCE PHOTO LIBRARY