Pityriasis Rosea

Causes

The cause of pityriasis rosea is not known. It may be triggered by a viral infection.

Risk Factors

Pityriasis rosea is more common in people who are 10 to 35 years of age. Pregnant women may be at higher risk.

Symptoms

Symptoms that may appear before the rash include:

• Lack of energy
• Fever
• Headache
• Sore throat

The rash starts with one large, oval, and scaly patch on the back, stomach, armpit, or chest. In time, a person may also have:

• Rose colored patches that may have scaly edges
• Mild to severe itching
• Itching that gets worse when the body overheats, such as with exercise or after a shower
• Skin redness or swelling

Diagnosis

The doctor will ask about symptoms and past health. A physical exam will be done. It will focus on the skin. This is often enough to make the diagnosis.

If the diagnosis is not clear, then you may need to see a doctor who treats the skin. A sample of the skin may be tested. This can be done with a biopsy.

Skin Biopsy

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Treatment

The rash usually goes away on its own in about six weeks. The goal of treatment is to manage symptoms during this time. Choices are:

• Supportive care, such as warm oatmeal baths and using moisturizer
• Medicines to ease itching, such as:
  • Antiviral medicines
  • Antibiotics
  • Antihistamines
  • Corticosteroids
• Ultraviolet light therapy to speed healing

Prevention

There are no known guidelines to prevent pityriasis rosea.