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July 1989

Pityriasis Rotunda

Author Affiliations

Department of Dermatology University of the Witwatersrand Medical School York Street, Parktown, Johannesburg 2193, South Africa

Arch Dermatol. 1989;125(7):1002. doi:10.1001/archderm.1989.01670190136026

To the Editor.—  Commenting in a letter to the Archives, Lewis suggested that pityriasis rotunda may be a variant of tinea corporis. Although the article by DiBisceglie et al2 did not include relevant investigations to exclude this possibility, I would like to draw attention to previous literature regarding this condition.Pityriasis rotunda is a well-known disorder consisting of perfectly round or polycyclic lesions that are uniformly scaly and hyperpigmented.Pityriasis rotunda has been described in association with many underlying diseases, both benign and malignant, as well as occurring in the absence of any underlying condition. The histologic characteristics are identical to those of ichthyosis vulgaris, namely, hyperkeratosis, a sparse granular layer, and basal hyperpigmentation.The diagnosis of pityriasis versicolor was considered by Sarkany and Hare,3 but no organism could be detected either by fluorescence under Wood's light or by microscopic examination and fungal culture. Histologic sections stained with

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