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What is an Exanthema?

Mary McMahon
Updated May 17, 2024
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An exanthema is a rash, including redness, bumps, and sometimes pustules, that covers a large area of the body. People can develop such rashes as a result of toxin exposure, infection, or a bad reaction to medication. Treatment of the rash depends on identifying the underlying cause and managing it appropriately while providing supportive treatment to the patient to prevent complications. A dermatologist may participate in care, along with a specialist who can treat the underlying problem causing the rash.

Exanthema is famously a problem in children, as several childhood diseases like rubella, roseola, scarlet fever, and measles are associated with a distinctive reddish rash. The rash may appear in tender, sensitive areas of the body first, spreading over time. Adults can also develop a whole-body rash. The rash may itch, tingle, or sting, depending on what is causing it, and the patient may also develop a fever and other symptoms like coughing or disorientation.

When exanthema is identified, the first step is to find out why. If the rash is caused by a toxin, it may be necessary to administer drugs to reverse the action of the toxin, or to provide supportive care to help the patient's body metabolize and express the toxic compound. Toxins can cause issues like shortness of breath and heart problems, making it important to monitor the patient carefully during treatment for signs of complications.

For rashes caused by bacterial or viral infections, medication to kill the organism causing the infection is necessary, along with supportive treatment. Cool baths can help reduce fever, and patients may also benefit from soothing creams to address the itching and irritation of the rash. Sometimes exanthema is the result of an autoimmune reaction, where the patient's body starts to attack itself, often in the wake of a systemic infection. In these cases, drugs to suppress immune activity can help reduce the rash.

In bad drug reactions, the drug causing the exanthema should be withdrawn, and the patient may need other supportive treatment. This can include a new drug to address the condition the original drug was treating, along with monitoring for signs of additional adverse reactions like organ damage. A doctor will note the drug reaction in the patient's chart to avoid administering that medication in the future. Patients who have a history of exanthema after taking certain medications should make their doctors aware so they know not to prescribe related drugs.

WiseGEEK is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Mary McMahon
By Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a WiseGEEK researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

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Mary McMahon

Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a...

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