What causes erythema dyschromicum perstans (EDP)?

Updated: Apr 19, 2019
  • Author: Robert A Schwartz, MD, MPH; Chief Editor: Dirk M Elston, MD  more...
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The etiology of erythema dyschromicum perstans remains unknown. It has been associated with ingestion of ammonium nitrate and whipworm infestation, but a specific etiology has not been established in any instance. The geographical distribution of erythema dyschromicum perstans has led some authors to suggest environmental factors, but all attempts to find these pollutants have failed.

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