Interdigital foot infections are mostly caused initially by dermatophytes, 
yeasts and less frequently by bacteria. Erythrasma caused by Corynebacterium 
minutissimum can be confused with superficial mycoses. The aim of the study was 
to determine the prevalence of the etiologic agents of superficial mycoses and 
the frequency of Corynebacterium minutissimum in interdigital foot infections. 
All the samples obtained from the 121 patients with interdigital foot infections 
were examined directly with the use of 20% potassium hydroxide mounts and Gram 
stain under the microscope and cultured on Sabouraud's dextrose agar plates. In 
identification of superficial mycoses, the rate was found to be 14% with the 
cultural method and 14% with direct microscopic examination. Using a combination 
of direct microscopic examination and culture, a 33.8% ratio was achieved. In 
the culture of these samples, the most isolated factor was Trichophyton rubrum 
(33.7%). In 24 of the patients (19.8%) Corynebacterium minutissimum was detected 
by Gram staining, in 6 of these patients Trichophyton rubrum was found, 
Trichophyton mentagrophytes was found in 2 and Trichosporon spp. was found in 1. 
The examination of interdigital foot lesions in the laboratory, the coexistence 
of erythrasma with dermatophytes and yeast should be considered.