You feel a tingle. You see some redness. Or maybe you notice the signs of blisters on your lip or mouth.
No matter when you notice a cold sore coming on, that's when you should start using prescription
ZOVIRAX® (acyclovir) Cream 5%. Why? Because you may be able to shorten the length of time you have a
cold sore. So ask your doctor about it at your next appointment.