Pityriasis Rosea


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Related to Pityriasis Rosea: pityriasis versicolor

Pityriasis Rosea

 

in humans, an acute dermatosis believed to be of a viral nature. It is observed principally in middle-aged individuals and occurs most often in spring or autumn. The disease is usually preceded by overchilling and a cold. Pityriasis rosea is characterized by the appearance on the trunk and, less frequently, on the extremities of small, yellowish pink, rounded or oval spots, measuring 1.5–2 cm across.

The numerous skin eruptions are usually preceded by the appearance of a single spot, called the herald patch, that is distinguished by its large size. An eruption protrudes over the surrounding skin. Its periphery is characterized by a bright pink ridge, and its central part is slightly depressed and covered with tiny scales that have a parched and wrinkled appearance. The surface of some eruptions is covered with fine furfuraceous desquamation. Slight itching may occur. In four to six weeks the eruptions disappear without a trace.

Pityriasis rosea is treated with sulfanilamides, antibiotics, and antipyretics when fever and malaise are present. Externally it is treated with inert powders, mash, and corticosteroids in the form of ointments. Prolonged bathing should be avoided.

REFERENCE

Mashkilleison, L. N. Chastnaia dermatologiia. Moscow, 1965.

I. IA. SHAKHTMEISTER

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All the patients attending the Dermatology Outpatient Department were screened and patients with pityriasis rosea were enrolled.
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Unlike the two recently named illnesses just described, pityriasis rosea (PR) was described many decades ago.
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The cutaneous lesions are mainly flat warts, reddish-brown scaly macules resembling tinea versicolor or pityriasis rosea.
Pityriasis rosea may appear similar to tinea versicolor with erythema and scale, but it typically begins with a single, large herald patch, and scale is primarily at the outer border of the lesions.
The differential diagnosis of UP can include urticaria, atopic dermatitis, contact dermatitis, pityriasis rosea, an allergic reaction/ drug eruption, Henoch-Schonlein purpura, erythema multiforme, fifth disease, folliculitis, guttate psoriasis, miliaria rubra, insect bites, viral exanthem, lichen planus, and scabies.
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