Erythema multiforme Definition
Erythema multiforme is a skin disorder due to an
allergic reaction or infection.
Lyell's syndrome; Stevens-Johnson syndrome; Erythema multiforme minor; Erythema multiforme major
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
Multiple skin lesions:
Start quickly and may return
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:
Controlling the illness that is causing the condition
Treating the symptoms
Stop taking any suspected medications, with your doctor's approval.
Treatment of mild symptoms may include:
Medications such as antihistamines to control itching
Moist compresses applied to the skin
Oral antiviral medication if it is caused by herpes simplex
Over-the-counter medications (such as acetaminophen) to reduce fever and discomfort
Topical anesthetics (especially for mouth lesions) to ease discomfort that interferes with eating and drinking
Treatment of severe symptoms may include:
Antibiotics to control any skin infections
Corticosteroids to control inflammation
Hospitalization and treatment in an intensive care or burn care unit for severe cases, Stevens-Johnson syndrome, and toxic epidermal necrolysis
Intravenous immunoglobulins (IVIG) to stop the disease process
Practicing good hygiene and staying away from other people may help prevent
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.
Complications 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.
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.
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.
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