Which conditions should be included in the differential diagnoses of pityriasis lichenoides?

Updated: Sep 11, 2020
  • Author: Jeffrey P Callen, MD; Chief Editor: Dirk M Elston, MD  more...
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Answer

Also consider the following:

  • Arthropod bite
  • Disseminated herpes zoster
  • Drug eruption
  • Pityriasis rosea [29]
  • Primary HIV infection
  • Secondary syphilis
  • Vasculitis
  • Viral exanthem

A diagnosis of lymphomatoid papulosis or papular mycosis fungoides should not be missed because of the theoretical possibility of subsequent development of a myeloproliferative disorder. Biopsy specimens should be obtained to confirm a diagnosis of PLEVA. Some cases may be drug-induced. [30]


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