Soraya suddenly developed the oddest rash. It looked like a bunch of tiny targets on her lower legs. She'd heard that Lyme disease can cause a target-shaped rash, so she and her mom made an appointment to see the doctor. The doctor explained that Soraya didn't have Lyme disease, but she did have a condition called erythema multiforme.
Erythema multiforme (pronounced: air-ah-thee-mah mul-ti-for-me) is a rash that forms in reaction to an infection. Sometimes, a person may also get the rash after taking a medication.
Erythema multiforme usually starts off looking like pink or red blotches. The blotches develop over a few days into round target (often called "bulls-eye") shapes with red, pink, and pale rings. The target shapes sometimes have blisters or scabs in the middle. The rash itches a lot and might even burn.
An erythema multiforme rash usually appears on both sides of the body, often on a person's arms, hands, legs, and feet. Some people also get it on the face, neck, and torso — and sometimes the lips and inside the mouth. As the rash goes away (which usually takes a couple of weeks), it may turn a brownish color.
The rash may appear on its own, though some people also may have these problems:
Doctors think most cases of erythema multiforme happen when an infection causes the body's immune system to damage the skin cells. Erythema multiforme is often linked to the herpes simplex virus (the virus that causes cold sores). But bacteria, fungi, and other viruses also can cause someone to develop the condition.
A few people may get the rash after taking certain medications, such as seizure medicines, anesthesia medicines, nonsteroidal anti-inflammatory medicines (e.g., ibuprofen), antibacterial medications, and penicillin or other antibiotics. If you take any of these medicines and notice what looks like an erythema multiforme rash starting, call your doctor but don't stop taking your medicine unless the doctor suggests it.
Sometimes a person can develop erythema multiforme after getting an immunization, such as the tetanus-diphtheria-acellular pertussis (Tdap) or hepatitis B vaccines. Occasionally, doctors won't know what caused the rash to develop, but still can help someone heal.
Erythema multiforme is not contagious. So if you do have it, you won't give it to someone else. If someone you know has it, it can't be passed to you.
Call your doctor if you get a bulls-eye (target-shaped) rash of any kind. Doctors can usually recognize erythema multiforme just by looking at the rash.
To help figure out why you got the rash, your doctor will ask questions — like whether you've had any recent infections or what medications you're taking.
Erythema multiforme eventually goes away on its own. In most cases, though, a doctor will try to treat whatever caused you to have the reaction. If it looks like an infection triggered the reaction, a doctor may recommend an antibiotic medicine. If it's thought that a medication caused it, your doctor will probably tell you to stop taking it.
To help you feel better, the doctor may recommend:
These things can provide relief from pain or itchiness, but they won't make the rash go away any faster.
Most people who get erythema multiforme have no long-term problems. The rash usually goes away in 1 to 2 weeks, but it can last as long as 4 weeks. Erythema multiforme doesn't leave scars, but some people might notice dark spots that last for several months after the rash goes away.
Erythema multiforme may come back again (recur), especially if you get re-exposed to whatever caused it in the first place. In cases where the herpes simplex virus is thought to be causing the rash to return, doctors might prescribe a daily antiviral medicine.
Reviewed by: Kate M. Cronan, MD
Date reviewed: June 2012
|Centers for Disease Control and Prevention (CDC) The CDC (the national public health institute of the United States) promotes health and quality of life by preventing and controlling disease, injury, and disability.|
|Cold Sores (HSV-1) Cold sores (also known as fever blisters) are pretty common and lots of people get them. So what causes them and what can you do?|
|Eczema Eczema is a common skin problem among teens. If you have eczema, read this article to find out more about it and how you can deal with the skin stress.|
|Lyme Disease Lyme disease can be treated if it's caught early. So read this to find out what causes it, how it's treated, and how to prevent it.|
|Chiggers Chigger bites aren't painful but they do cause intense itching. Find out more about the tiny critters that cause these itchy bites and what you can do to deal with and prevent them.|
|Scabies Scabies is a skin infection caused by tiny mites that burrow into the top layer of human skin to lay their eggs. Learn how scabies is spread, how to avoid it, and how doctors treat it.|
|Hives (Urticaria) Hives cause raised red bumps or welts on the skin. They're pretty common and usually not serious. Find out what to do about hives in this article for teens.|
|Shingles Shingles is rare in teens with healthy immune systems, and mostly affects older adults. But it's good to know the basics about this skin rash, which is caused by the same virus that causes chickenpox.|
|Pityriasis Rosea Pityriasis rosea is a pink or gray skin rash that's common in teens and young adults. It may itch, but it's harmless. Find out what to do about it in this article for teens.|
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