What is the role of biopsies in the workup of drug eruptions?

Updated: Oct 14, 2020
  • Author: Jonathan E Blume, MD; Chief Editor: Dirk M Elston, MD  more...
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Biopsy can be helpful in confirming the diagnosis of a drug eruption (eg, by showing eosinophils in morbilliform eruptions or numerous neutrophils without vasculitis in persons with Sweet syndrome). Drug eruptions are associated with a wide range of histologic findings, and immunomodulating medications can alter the histologic picture. [51]

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