•  
  •  

Cold Sores

Cold sores, sometimes called fever blisters, are clusters of small blisters on the lip and outer edge of the mouth. Cold sores are caused by the herpes simplex virus.

After a person is infected with the herpes simplex virus, cold sores can occur repeatedly. The sores often weep a clear fluid and form scabs after a few days. A cold sore typically lasts 8 to 10 days and is contagious until the blister is completely crusted over.

Cold sores usually heal on their own. Medicines are available for more rapid healing, reducing pain, and reducing the severity of future outbreaks.

Last Revised: February 1, 2012

Author: Healthwise Staff

Medical Review: E. Gregory Thompson, MD - Internal Medicine & Thomas M. Bailey, MD - Family Medicine

This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.

To learn more visit Healthwise.org

© 1995-2012 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.