Pityriasis rosea

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Summary of Pityriasis rosea

Pityriasis rosea is a benign skin rash but may inflict substantial discomfort in certain cases. Classically, it begins with a single "herald patch" lesion, followed in 1 or 2 weeks by a generalized body rash lasting up to 12 weeks, however usually after 6 - 8 weeks, it typically self-resolves.

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Pityriasis rosea

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Figure 6.2 The histological appearance of lichen planus. There is a lymphocytic inﬁltrate at the junction between the dermis and epidermis which is known as interface dermatitis. PITYRIASIS ROSEA osms.it/pityriasis-rosea PATHOLOGY & CAUSES ▪ Self-limiting acute dermatosis ▪ Unknown etiology; may be viral in origin, related to human herpesvirus 7 (HHV7) SIGNS & SYMPTOMS ▪ Upper respiratory tract infection may precede rash ▪ “Herald patch” ▫ Solitary oval red plaque, usually located on trunk ▫ First skin lesion ▫ Spreads with central clearing, fading in 2–10 days ▪ 1–2 weeks after herald patch, multiple round/oval pink (white individuals of European descent)/dark brown (black individuals of sub-Saharan African descent) plaques with central scale appear 34 OSMOSIS.ORG ▪ Trunk, neck, upper arms, thighs; “Christmas tree” progression ▫ Across chest, then rib-line ▪ Pruritus ▪ Systemic ▫ Low-grade fever, headache, nausea, fatigue Figure 6.3 A herald patch is often seen at the onset of pityriasis rosea. It is a slightly raised, erythematous patch with superﬁcial scaling.

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Pityriasis rosea

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USMLE® Step 2 style questions USMLE

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A 19-year-old man comes to the clinic because of a rash that started as a single lesion a few days ago. It has since spread throughout his chest and back. The patient had an upper respiratory infection nine days ago. Physical examination shows salmon pink patches, as seen below. Both VDRL and FTA-AB tests are negative. Which of the following is the most likely diagnosis?

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