Fever Blisters Directory
Fever blisters, also called cold sores, are painful infections caused by the herpes simplex virus (HSV). Blisters may show up anywhere on your body but are most likely to appear on your gums, the outside of your mouth and lips, your nose, cheeks, or fingers. The sores usually last seven to 10 days and are contagious until they crust over completely. Although cold sores generally are not serious, the infection can cause significant health problems for some people, including people with a weakened immune system. Follow the links below to find WebMD's comprehensive coverage about how fever blisters are contracted, what they looks like, how to treat them, and much more.
Herpes Simplex Type 1 and Type 2
WebMD explains the two types of herpes simplex virus, including causes, symptoms, and treatment.
Cold Sores Symptoms
Learn more from WebMD about the symptoms of cold sores.
What Are Cold Sores?
Learn about the causes and symptoms of cold sores, also known as fever blisters.
Oral Herpes Basics
WebMD provides a comprehensive look at oral herpes, or cold sores, which are caused by the herpes simplex virus.
8 Winter Tips for Healthy Living
A better diet, a little more exercise -- healthy living is easy if you take it one tip at a time.
Minor Athlete Infections and Other Annoyances: How to Prevent and Treat Them
Herpes, athlete’s foot, jock itch, ringworm, impetigo, swimmer’s hair, and more — find out how to prevent and treat minor athlete infections.
Slideshows & Images
Picture of Cold Sores (Fever Blisters)
Cold sores, sometimes called fever blisters, are groups of small blisters on the lip and around the mouth. The skin around the blisters is often red, swollen, and sore.
Slideshow: Top Problems in Your Mouth
Sores, painful gums, bad breath -- what’s going on in your mouth? Found out with our slideshow of the most common mouth problems.
Slideshow: Treating and Preventing Cold Sores
Besides being itchy and painful, cold sores make you feel self-conscious. This slideshow illustrates how to prevent and treat cold sores caused by the herpes virus.