pityriasis rosea

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Related to pityriasis rosea: pityriasis versicolor
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Noun1.pityriasis rosea - pityriasis in which an itchy rash develops over the trunk and extremities
pityriasis - any of several skin disorders characterized by shedding dry flakes of skin
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Accuracy of dermoscopic criteria for the diagnosis of psoriasis, dermatitis, lichen planus and pityriasis rosea. Br J Dermatol 2012;166:1198-205.
* Pityriasis rosea is a viral exanthem that may be associated with constitutional symptoms and often presents initially with a herald patch progressing to a classic "Christmas tree" distribution with a fine collarette of scale.
Christmas tree rash (pityriasis rosea) is a fine, itchy, scaly rash that usually appears first as a single patch on the chest, abdomen or back.
En sik goruldugu hastaliklar, pso- ryaz, alopecia areata, ekzema, dishidroz, parakeratosis pustu- losa, pityriasis rosea, lichen planus, sarkoidoz ve travmalardir.
Among all, 112 pieces of data were psoriasis, 61 seboreic dermatitis, 72 lichen planus, 49 pityriasis rosea, 52 cronic dermatitis and 20 pityriasis rubra pilaris.
Erythemato-squamous diseases to be classified include pityriasis rubra pilaris, seborrheic dermatitis, psoriasis, lichen planus, chronic dermatitis, and pityriasis rosea. Clinically; patients are first evaluated in terms of 12 features, including degree of scaling and erythema; presence or absence of defined lesion borders; itching and koebner phenomenon; papule formation; family history; and involvement of the oral mucosa, knees, elbows, and scalp, which are important indices in the differential diagnosis of erythemato-squamous diseases.
Among erythematous and squamatous diseases, which were found in 312 subjects (3.08%), psoriasis (1.34%) and pityriasis rosea (1.27%) were observed most commonly.
"Epidermotropic MZL represents a distinctive nosologic B-cell lymphoma that should be considered a diagnostic possibility in older men who present with an unexplained papulosquamous eruption resembling pityriasis rosea," the researchers wrote.
Meyerson postulated pityriasis rosea as the cause of eruption, but it is unclear.
Other differential diagnoses include maculopapular mastocytosis, postinflammatory hyperpigmentation, morphea, pityriasis rosea, Addison disease, hemochromatosis, arsenism, contact dermatitis, multiple fixed drug eruption, confluent and reticulated papillomatosis of Gougerot and Carteaud, tuberculoid leprosy, and pinta.
Pityriasis rosea is an acute self-limiting disease, probably infective in origin, affecting mainly children and young adults, and characterised by distinctive skin eruption and minimal constitutional symptoms.
Pityriasis Rosea: The Afro-Caribbeans show several unusual variations in the features of pityriasis rosea.