What is the role of biopsy in the diagnosis of tinea cruris (jock itch)?

Updated: Feb 22, 2018
  • Author: Michael Wiederkehr, MD; Chief Editor: Dirk M Elston, MD  more...
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Negative KOH wet mount examination and cultures exclude other conditions in the differential diagnosis. If tinea cruris still is suggested, repeat the tests, several times if necessary.

Punch biopsy is diagnostic but has low sensitivity and low specificity. Using periodic acid-Schiff stain (fungal elements appear pink) or methenamine silver stains (fungal elements appear brown or black) on the processed tissue enhances the sensitivity of the biopsy procedure.

Wood lamp examination may be helpful to exclude erythrasma, which reveals coral red florescence of the affected area.

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