Last updated: November 4, 2021

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Erythrasma is a skin infection caused by Corynebacterium minutissimum, a part of the normal skin flora. Optimal conditions for bacterial growth are provided by moist skin fold areas. The infection is particularly common in obese individuals with diabetes mellitus. Patients present with well-demarcated erythematous or brown patches with fine scaling and wrinkling in intertriginous areas (e.g., groin, toe webs). The diagnosis is confirmed by coral-red fluorescence under wood lamp examination. Local disease is treated with topical antibiotic therapy, while extensive disease requires systemic antibiotic treatment.




Intertrigo (intertriginous dermatitis) [4]

The differential diagnoses listed here are not exhaustive.


  1. Hassan AU. USMLE Platinum Notes Step 2 Ck: The Complete Preparatory Guide. Jaypee Brothers Medical Publishers ; 2016
  2. Brice S. Erythrasma. In: Post TW, ed. UpToDate. Waltham, MA: UpToDate. updated: July 18, 2017. Accessed: December 18, 2017.
  3. Kibbi AG. Erythrasma. In: James WD, Erythrasma. New York, NY: WebMD. Updated: July 20, 2017. Accessed: December 18, 2017.
  4. Kalra MG, Higgins KE, Kinney BS. Intertrigo and secondary skin infections. Am Fam Physician. 2014; 89 (7): p.569-73.

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