# Chromatic Variants of Pityriasis Versicolor and Molecular Species Identification Using Polymerase Chain Reaction-Restriction Fragment Length Polymorphism (PCR-RFLP)

## TL;DR

This study identifies the most common Malassezia species causing pityriasis versicolor in Acapulco, Mexico, using a molecular method called PCR-RFLP.

## Contribution

The study applies PCR-RFLP for species identification of Malassezia in PV and reports the prevalence of specific species in a tropical setting.

## Key findings

- M. globosa and M. furfur were the most frequently identified species in PV cases.
- The hypochromic variant of PV was the most common clinical presentation.
- PCR-RFLP proved effective for species-level identification despite some unsuccessful identifications.

## Abstract

Background: Pityriasis versicolor (PV) is a common superficial mycosis caused by Malassezia species. To describe the clinical and epidemiological characteristics of PV in Acapulco, Mexico, and to identify the associated Malassezia species using polymerase chain reaction–restriction fragment length polymorphism (PCR-RFLP). Methods: A cross-sectional study was conducted in 2024 at Acapulco General Hospital and a private dermatology clinic. Patients with clinically suspected PV and no recent antifungal or immunosuppressive treatment were enrolled. Skin scales were examined microscopically and cultured on modified Dixon agar. Isolates were identified using conventional methods and PCR-RFLP with HhaI and BstCI enzymes. Results: Sixty-nine patients were included; 68.1% were male, and the most affected age group was 11–20 years (34.8%). The hypochromic variant predominated (63.8%). PCR-RFLP identified M. globosa (33.3%) and M. furfur (31.9%) as the most frequent species, followed by M. restricta, M. sympodialis, and M. slooffiae. Species identification was unsuccessful in 11.6% of isolates. No statistically significant associations were found between clinical variants, gender, or species distribution. Conclusions: M. globosa and M. furfur were the predominant species in this tropical Mexican cohort. PCR-RFLP is a practical option for species-level identification, highlighting the diversity of Malassezia in PV.