May 26, 2016
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Pityriasis Rosea (cont.)

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How is pityriasis rosea diagnosed?

Pityriasis rosea is usually diagnosed solely on the basis of its appearance, particularly the onset of the distinct large herald patch and the symmetrical Christmas tree presentation. Also, the herald patch tends to have a fine scale with a definite border, the so-called "collarette." To rule out other types of skin disorders, a physician may scrape the skin and examine the scales under the microscope to detect fungus infection that could mimic pityriasis rosea. Also, blood tests including rapid plasma reagent (RPR) may be done to detect secondary syphilis, which also may mimic pityriasis rosea. In some cases, a skin biopsy may be required to rule out skin conditions.

What are some common misdiagnoses of pityriasis rosea?

The first herald patch of pityriasis rosea may look very similar in appearance to ringworm (tinea corporis). Pityriasis rosea has also been mistaken with eczema and psoriasis, which can occur as similar scaly patches, but not in the same distribution as pityriasis rosea.

Pityriasis rosea may be misdiagnosed as

Medically Reviewed by a Doctor on 2/25/2016

Source: MedicineNet.com
http://www.medicinenet.com/pityriasis_rosea/article.htm

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