Skin inflammatory (nontumor)
Lichenoid and interface reaction patterns
Pityriasis lichenoides chronica


Topic Completed: 1 August 2011

Revised: 2 April 2019

Copyright: 2002-2019, PathologyOutlines.com, Inc.

PubMed Search: Pityriasis lichenoides chronica [title]
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Cite this page: Hamodat M Pityriasis lichenoides chronica. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/skinnontumorPLC.html. Accessed April 26th, 2019.
Definition / general
  • Presents with red-brown papules with wafer-like scale
  • Overlaps with pityriasis lichenoides et varioliformis acuta
  • Shows predeliction for males in late childhood and early adulthood
  • Involve the arms, legs, trunk and buttocks; flexors are more commonly affected than the extensors
  • Associated with itching and burning sensation
  • Some seasonal variation, worsening in winter and some improvement in sunlight
Case reports
Clinical images

Contributed by Dr. Mark R. Wick

Arms

Breast skin



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Pityriasis lichenoides chronica

Microscopic (histologic) description
  • Similar to PLEVA, but less destructive
  • Parakeratosis present in well-demarcated zones; vacuolar interface change and lymphocyte exocytosis less than PLEVA
  • Wedge shaped pattern of dermal lymphocytic infiltrate
  • The chronic lesion shows parakeratosis with lymphocytes, similar to Munro microabscesses of psoriasis
  • Purpura is often present
Microscopic (histologic) images

Contributed by Dr. Mark R. Wick

Breast skin

Positive stains
  • IgM and C3 in the walls of the superficial dermal blood vessels
Additional references
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