Pityriasis Rosea
Pityriasis rosea is a common skin disease characterized by a rash that can last from several weeks to several months. The rash first presents with a solitary scaly patch, usually on the upper trunk known as a herald patch. The herald patch resembles ringworm somewhat and is often confused with it. Within one to two weeks, a widespread rash appears. Pityriasis rosea affects people of all ages but is more common in older children and teens. It most often develops in the spring and the fall but can occur anytime.
Cause
The exact cause is unknown, but may be linked to a virus infection. The condition is not contagious.
Clinical features
A herald patch appears, particularly on the trunk, upper arms, neck and thighs. Later more pink patches may appear on the body and arms and legs. The patch is oval, dry, and pink to red and has a well defined scaly border. Typically, the eruption will peak in about two weeks and slowly diminish over the following month. Mild to intermittent itching is seen, and strenuous activities such as jogging may aggravate the rash. Sometimes the rash may be accompanied by flu- like symptoms such as fatigue, nausea and aching. Pityriasis Rosea lasts from 6 to 12 weeks and then disappears leaving no scars.
Treatment
Dermatologists diagnose the condition by physical observation of the site and pattern of patches or may order blood tests or a skin biopsy.
Most cases of pityriasis rosea require no treatment and it usually resolves itself.
Mild inflammation and itching can be relieved by antihistamines or anti-itching creams.
Topical cream or lotion can be prescribed for itchy skin. If itching is severe systemic steroids are prescribed.
For severe cases, anti-viral drug famciclovir (Famvir®) and the antibiotic erythromycin (Ery-tab®) may heal the lesions in 1 to 2 weeks. Oral anti-inflammatory medications such as prednisone may also be necessary to promote healing in severe cases as well as ultraviolet therapy or light therapy.
Preventive tips
- Avoid using soap or very hot water to the affected area as it can irritate the rash
- Strenuous activity should be avoided as it can aggravate the rash
- Avoid excessive sun exposure
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See complete Wikipedia article here.
For more information from the American Academy of Dermatology click here.
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