Σφακιανάκης Αλέξανδρος
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Κυριακή 19 Νοεμβρίου 2017

Recurrent and disseminated pityriasis versicolor: A novel clinical form consequent to Malassezia-host interaction?

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Publication date: November 2017
Source:Medical Hypotheses, Volume 109
Author(s): Karina Romero-Sandoval, Anderson Alves Costa, Maria Glória Teixeira Sousa, Celia Regina Furucho, Neusa Valente, Paulo R. Criado, Valeria Aoki, Gil Benard
Pityriasis versicolor is a superficial fungal infection caused by Malassezia spp. The aim of this study is to propose the definition of a new clinical entity: the recurrent and disseminated pityriasis versicolor (RDPV). All patients with RDPV were enrolled over an eight-month period. Clinical and epidemiological data were obtained, Malassezia (M.) species were isolated in cultures and identified by phenotypic and molecular characterization, skin biopsies were taken from active lesions, serum levels of immunoglobulin E were obtained and therapeutic schemes were evaluated. A total of 16 patients were included (11 male, 5 female). The most frequently isolated species were M. japonica (n = 3) and M. furfur (n = 3). This is the first study that isolates M. japonica in patients with pityriasis versicolor; interestingly, those were recalcitrant patients. Seven patients (43.8%) had no cure with any of the proposed treatments; among those, 5 (71.4%) had increased serum IgE levels. The most effective treatment was itraconazole 200 mg daily for 28 days. The RDPV has very different features from the classic form, including a poor response to treatment, and the isolation of different Malassezia species; therefore, we propose a hypothesis for the definition of a new clinical condition (RDPV), which could be a result of the interaction Malassezia-host.



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