What is the role of KOH exam in the evaluation of erythrasma?

Updated: Jun 11, 2020
  • Author: Abdul-Ghani Kibbi, MD, FACP; Chief Editor: William D James, MD  more...
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It is highly recommended to perform a direct KOH examination to exclude dermatophytosis because 31.6-62% of patients with erythrasma may have a concurrent infection with a dermatophyte. This has been shown in one study where Trichophyton rubrum (81.25%), Trichophyton mentagrophytes (6.25%), and Candida species (12.5%) were demonstrated. [30]

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