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KMID : 0032219900020010021
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Annals of Dermatology
1990 Volume.2 No. 1 p.21 ~ p.21
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Pityriasis Rotunda
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Linda M.Serwatka
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Abstract
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Pityriasis rotunda (PR) is an uncommon dermatosis characterized by perfectly round, scaly patches. Thus, it has been considered by some to be a dermatophyte infection. PR has also been associated with a variety of underlying systemic diseases. A case is reported, herein, of PR associated with Paget’s disease of the bone. Potassium hydroxide (KOH) examination of scale from the lesions was negative. Histologically there was orthokeratotic hyperkeratosis, a normal granular layer, and a mild lymphohistiocytic perivascular infiltrate in the superficial dermis. Sections stained with methenamme silver were negative for fungus. These findings support the theory that PR is not a dermatophyte infection, but a variant of acquired ichthyosis. Treatment with an alpha hydroxy acid lotion is discussed.
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KEYWORD
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Dermatophyte infection, Paget´s disease of the bone, Pityriasis rotunda
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