DEAR DR. ROACH: I am wondering about oral herpes. Have there been any advances made for treating or preventing oral herpes? I know about and use Abreva, but is there anything that works better? -- L.P.
ANSWER: Herpes simplex virus type one is the cause of oral herpes, usually called "cold sores" or "fever blisters." These often start as a clear fluid-filled blister on the lips or in the mouth. Many people carry the virus, and some people experience periodic outbreaks of these painful lesions.