A cold sore or fever blister—also called oral herpes—is an infection on or around the lips or mouth area caused by the herpes simplex virus type 1 (HSV-1). The cold sore virus is common. In fact, 8 out of 10 people have it. Most people get it by the time they’re 20 years old.
The cold sore virus lives in your nerve tissue. While “asleep,” the virus produces no symptoms. When it “wakes up,” the virus can affect your skin’s surface and cause a blister to form on the lip area or other areas.
There is no cure for fever blisters or the cold sore virus, but there are ways to manage your cold sore symptoms.
Talk to your doctor if:
- Cold sore symptoms do not improve in 7 days
- Irritation, pain or redness persists or worsens
- Swelling, rash or fever develops
Try Carmex® Cold Sore Treatment to hide your cold sore while you treat it
Back to top