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Abstract Background and Objective: Superficial mycoses are increasing in special conditions. This retrospective study was conducted to determine the epidemiological parameters of Pityriasis versicolor and Erythrasma during 1994 – 2011. Material and Methods: In this study, we assessed the results of direct microscopic study and the other data of the patients for Pityriasis versicolor and Erythrasma in 1994 – 2011. Results: Of 2265, 1294 (57%) suffered from pityriasis versicolor, who were mostly males (60%). The highest frequency was related to 20-29 year old and the lowest to 0-9. High school and university students were the most infected groups (33%), September was the most common period and the most common site of involvement was chest and abdomen. The people infected with Erythrasma (971 42%), were mostly 30 -39 year old , males( 58% ) , urban ( 98% ) , reported in July and involved in groin. Conclusion: The frequency of both diseases was high in active age group, males, and the hot months of the year, which are the most common predisposing factors. Keywords: Pityriasis versicolor Erythrasma Kermanshah