It’s Cold Sore Season If you get fever blisters on your lips, they may be more likely to make an appearance this time of year. You can blame stress (the Holiday kind), chapped lips (any trauma to your lips can trigger an outbreak of cold sores, which are caused by the herpes simplex virus) or a weakened immune system during wintertime. As soon as you feel that familiar tingling or burning sensation that often begins a day or two before a cold sore forms, call your doctor or Dr. Armijo if you are a patient and he can prescribe acyclovir, an antiviral oral medication that can cut the healing time in half. Dr. Armijo also recommends Viroxyn a liquid medication/ointment that (depending on when you start it) can cut the healing time by 75%. Give us a call if you have any questions about this medicine 505-797-1000.