Erythema Multiforme
What causes Erythema Multiforme?
How does the herpes simplex virus cause disease?
How is Erythema Multiforme diagnosed?
How is Erythema Multiforme treated?
What is Erythema Multiforme?
Erythema Multiforme is an uncommon, self-limited symmetrical skin rash with target lesions that begins abruptly and heals in 7 to 14 days.
What causes Erythema Multiforme?
For most people, a herpes simplex virus infection causes Erythema Multiforme, such as an infection of the lip (i.e., a cold sore). Occasionally, Erythema Multiforme is caused by a herpes simplex virus infection of the genitals. Rarely, other viruses will cause it.
Who gets Erythema Multiforme?
Erythema Multiforme most commonly occurs in adolescents and, sometimes, in school age children.
How does the herpes simplex virus cause disease?
After growing at the site of a cold sore, the herpes simplex virus will travel through the bloodstream to the skin and then grow in the skin cells. The target lesions associated with Erythema Multiforme are the body's attempt to eliminate the virus. People who are especially susceptible to the herpes simplex virus have difficulty clearing it from their skin.
What are the common findings?
How is Erythema Multiforme diagnosed?
How is Erythema Multiforme treated?
There is not an effective treatment at the time of the attack of Erythema Multiforme. If individuals experience an attack of Erythema Multiforme every three months or less, a preventative treatment with an oral antiherpes virus agent, such as Zovirax, Valvir, or Famvir, is effective.
What are the complications?
If untreated, the target lesions on the skin will heal within two weeks. Steroid treatments may prolong an attack of Erythema Multiforme. Healing usually occurs without scarring of the skin.
How can Erythema Multiforme be prevented?
Prevention of those factors that precipitate cold sores can be helpful. For example, sunscreen use is beneficial because sun exposure may activate the herpes simplex virus that causes Erythema Multiforme.
What research is being done?
Studies are currently being conducted to examine how the body eliminates the herpes simplex virus. These studies will aid in understanding why individuals who are susceptible to the herpes simplex virus cannot effectively eliminate it despite immune responses that are normal.
About the Author
Dr. Weston is a Professor of Pediatrics and Dermatology at the University of Colorado Health Sciences Center and Chair of the Department of Dermatology. His scientific and clinical interests include Cutaneous immunology, Cutaneous virology, and Pediatric Dermatology.
Dr. Weston is the primary author of the Color Textbook of Pediatric Dermatology (Weston, Lane, Morelli; Mosby, Inc.) which is used by clinicians worldwide and is published in 4 languages.
He created the Genetic Skin Disorders clinic at the University of Colorado in 1998.
Copyright 2012 William L. Weston, M.D., All Rights Reserved