Erythema multiforme - All Information
Lyell's syndrome; Stevens-Johnson syndrome; Erythema multiforme minor; Erythema multiforme major
Definition of Erythema multiforme:
Erythema multiforme is a skin disorder due to an allergic reaction or infection.
Causes, incidence, and risk factors:
Erythema multiforme is a type of hypsersensitivity reaction that occurs in response to medications, infections, or illness. Medications include:
The exact cause is unknown. The disorder is believed to involve damage to the blood vessels of the skin, followed by damage to skin tissues.
Some forms of this condition are more severe than others.
- Erythema multiforme minor is not very serious. Most erythema multiforme is caused by herpes simplex or mycoplasma infections.
- Erythema multiforme major is more severe, and is known as Stevens-Johnson syndrome. The more severe form is usually caused by reactions to medications, rather than infections.
Erythema multiforme occurs primarily in children and young adults.
- General ill feeling
- Itching of the skin
- Joint aches
- Multiple skin lesions:
- Start quickly and may return
- May spread
- May appear as a nodule, papule, or macule and may look like hives
- Central sore surrounded by pale red rings, also called a "target", "iris", or "bulls-eye"
- May have vesicles and blisters of various sizes (bullae)
- Located on the upper body, legs, arms, palms, hands, or feet
- May involve the face or lips
- Usually even on both sides (symmetrical)
Other symptoms that may occur with this disease:
Signs and tests:
The diagnosis is based mainly on the appearance of the skin lesion, especially if there is a history of risk factors or related diseases.
Tests may include:
Treatment goals include:
Stop taking any suspected medications, with your doctor's approval.
Treatment of mild symptoms may include:
Treatment of severe symptoms may include:
Practicing good hygiene and staying away from other people may help prevent secondary infections.
Skin grafting may be helpful in cases in which large areas of the body are affected.
Mild forms of erythema multiforme usually get better in 2 - 6 weeks, but they may return. More severe forms may be difficult to treat. Stevens-Johnson syndrome and toxic epidermal necrolysis have high death rates.
- Body-wide infection, sepsis
- Loss of body fluids, shock
- Occasionally, lesions on internal organs causing:
- Heart inflammation (myocarditis)
- Lung inflammation (pneumonitis)
- Kidney inflammation (nephritis)
- Liver inflammation (hepatitis)
- Permanent skin damage and scarring
- Skin infection (cellulitis)
Calling your health care provider:
Go to the emergency room or call the local emergency number (such as 911) if you have symptoms of erythema multiforme. If a large area of the body is involved, it is an emergency situation.
- Reviewed last on: 10/10/2010
- Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine. Also reviewed by Kevin Berman, MD, PhD, Atlanta Center for Dermatologic Disease, Atlanta, GA. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
In: Habif TP, ed. Clinical Dermatology. 5th ed. Philadelphia, Pa: Mosby Elsevier; 2009:pp 710-714.
Weber DJ, Cohen MS, Morrell DS, Rutala WA. The acutely ill patient with fever and rash. In: Mandell GL, Bennett JE, Dolin R, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Disease. Philadelphia, Pa: Elsevier Churchill Livingstone; 2009:chap 52.
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