Abstract:

Objective To investigate the revelant risk factors and pathogenic species of Pityriasis versicolor (PV) and Malassezia folliculits(MF). Methods Clinically diagnosed PV and MF patients were classified as 1:1 matching controls. Self-made questionnaires were used to survey related factors. SPSS16.0 software was used to analyze risk factors by single factor and multiple factor logistic regression analysis. Positively cultured isolates were identified by both morphological and physiological characteristics. Results One hundred and sixty-three cases of PV and controls (1:1), 132 cases of MF and controls (1:1) were collected in all. Single factor analysis showed sweaty and oily skin was related with development of PV, while moist environment, sweaty and oily skin, excitant food, sweet and fatty food were related with development of MF. Multiple factor analysis further revealed that sweaty and oily skin was related with PV, while sweaty ,oily skin, male, sweet and fatty food were the exclusive risk factors of MF. Malassezia.sympodialis was the predominant species isolated from both diseases, however, Malassezia furfur accounted for a higher percentage in MF. Conclusions Sweaty and oily skin are common risk factors for both PV and MF, however, male, sweet and fatty food were specifically dangerous for MF. The distribution of Malassezia species was significantly different between the two groups (P<0.005).

Key words: pityriasis versicolor, folliculits, Malassezia, affect factors, logistic regression analysis