 [ Symptoms ] my 3 5 month old has a cold sore on upper lip is she old enough for anti viral medication if so what kind  i have read about the dangers of the herpes virus in newborns and the spread to liverbrain i will be calling my doctor but chances are they will say it is not a big deal however a baby in uk died because it was not treated and the virus spread internally i want to avoid this and have some information at the ready about antiviral medication [ Disease ] herpes simplex on the upper lip of any infant may not be treated unless it appears to progress antiviral drugs can be used in infants if clinically indicated like an herpetic outbreak in or near the eyes herpes spreads along a nerve route and will not course through the body internally from a lip lesion because the baby is so young and immunocompromised a medical professional should be consulted and the baby carefully examined to determine an individual course of action