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- Pityriasis rosea facts
- What is pityriasis rosea?
- Who gets pityriasis rosea?
- What causes pityriasis rosea?
- What are pityriasis rosea symptoms and signs?
- How is pityriasis rosea diagnosed?
- What are some common misdiagnoses of pityriasis rosea?
- What is the treatment for pityriasis rosea?
- What home remedies can I use for pityriasis rosea?
- Is pityriasis rosea dangerous during pregnancy?
- Can pityriasis rosea be prevented?
- What is the prognosis for pityriasis rosea?
- Where can I find more information and facts about pityriasis rosea?
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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
- fungal infection (tinea corporis),
- secondary syphilis,
- drug eruption (a diffuse body rash caused commonly by a reaction to a medications like an oral antibiotic),
- fixed drug eruption (a single small, circular or oval patch of skin rash caused by taking a medication),
- pityriasis lichenoides chronica,
- lichen planus,