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Exanthem – Causes, Symptoms & Treatment

An exanthem is a widespread skin rash that typically appears suddenly and can have many causes. It is often a sign of an infectious disease or an allergic reaction.

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Things worth knowing about "Exanthem"

An exanthem is a widespread skin rash that typically appears suddenly and can have many causes. It is often a sign of an infectious disease or an allergic reaction.

What Is an Exanthem?

The term exanthem (from Greek: exanthein = to bloom out) refers to a widespread skin rash that appears suddenly and may cover large areas of the body. It is not a disease in itself but a symptom of various underlying conditions. Exanthems can present as redness, spots, papules, blisters, or pustules and are often accompanied by itching, burning, or fever.

Causes

Exanthems can be triggered by a wide range of causes:

Viral infections: measles, rubella, chickenpox, fifth disease (erythema infectiosum), Epstein-Barr virus (infectious mononucleosis)
Bacterial infections: scarlet fever, Lyme disease, meningococcal infections
Allergic reactions: to medications (drug-induced exanthem), foods, or contact substances
Autoimmune conditions: e.g., systemic lupus erythematosus
Unknown causes: idiopathic exanthems

Symptoms

The appearance of an exanthem can vary widely depending on the cause. Common features include:

Flat red spots or patches (macules)
Raised bumps (papules)
Fluid-filled blisters (vesicles)
Pustules or crusting
Itching, burning, or pain
Associated fever, swollen lymph nodes, or general malaise

Diagnosis

Diagnosis is primarily based on a thorough physical examination and a detailed medical history. Key questions include:

When and where did the rash begin?
Is it spreading?
Are there accompanying symptoms such as fever or itching?
Have any new medications been taken recently?
Has there been contact with an infected person?

Additional investigations such as blood tests, swab cultures, allergy testing, or a skin biopsy may be used to determine the exact cause.

Treatment

Treatment of an exanthem depends on its underlying cause:

Viral exanthems: mostly symptomatic treatment (antipyretics, antipruritic agents); antiviral medications for specific infections such as herpes zoster
Bacterial exanthems: antibiotic therapy (e.g., for scarlet fever)
Allergic exanthems: removal of the triggering substance, antihistamines, corticosteroids in severe cases
Autoimmune-related exanthems: immunosuppressive therapy

In most cases, exanthems resolve without lasting damage. Sudden, severe rashes accompanied by fever, mucosal involvement, or difficulty breathing require immediate medical attention.

When to See a Doctor

The following warning signs require prompt medical evaluation:

Rapid spread of the rash over large body areas
High fever or severe general illness
Involvement of mucous membranes (mouth, eyes, genitals)
Purpuric discoloration (non-blanching red spots) – possible sign of meningococcal infection
Difficulty breathing or circulatory symptoms

References

Braun-Falco, O. et al.: Dermatology and Venereology. Springer Medizin Verlag, 6th edition, 2018.
Robert Koch Institut (RKI): Infectious Diseases A–Z, www.rki.de (accessed 2024).
Sterry, W., Burgdorf, W., Paus, R.: Checklist Dermatology. Georg Thieme Verlag, 7th edition, 2020.

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