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PITYRIASIS PIGMENTOSA
Author(s) -
Piamphongsant Thada
Publication year - 1983
Publication title -
the journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 65
eISSN - 1346-8138
pISSN - 0385-2407
DOI - 10.1111/j.1346-8138.1983.tb01150.x
Subject(s) - pityriasis , hypha , malassezia , pathology , tinea versicolor , biology , dermatology , budding , anatomy , botany , medicine
This paper proposes a new skin disease entity—pityriasis pigmentosa. Characteristic lesions of this disease are well defined, oval or round, pigmented patches covered with fine, adherent, wrinkled scales. The size of the lesions varies from 0.5–3 cm in diameter. Some lesions gyrate or coalesce into larger patches. The lesions are typically located on the waist and the extremities and are particularly common on the volar aspect of the upper arms and the posterior aspect of the upper thighs. Using Wood's light examination, a bright golden fluorescence is inevitably seen. Rapid identification can be made by use of the KOH/Parker Ink preparation. This reveals characteristic branched, segmented hyphae and clusters of budding, oval‐shaped yeast cells. Pityrosporum ovale produces hyphae when cultured in glycine‐ammonium phosphate buffered media. Pityrosporum orbiculare does not produce hyphae by this method. These clinical and laboratory findings distinguish a clinical entity differing from Tinea (Pityriasis) versicolor which is caused by Pityrosporum orbiculare .