Skin nontumor
Lichenoid / interface dermatoses
Pityriasis lichenoides chronica

Author: Mowafak Hamodat, M.D., MB.CH.B, MSc., FRCPC (see Authors page)

Revised: 25 May 2017, last major update August 2011

Copyright: (c) 2002-2016, PathologyOutlines.com, Inc.

PubMed Search: Pityriasis lichenoides chronica [title]

Cite this page: Pityriasis lichenoides chronica. PathologyOutlines.com website. http://pathologyoutlines.com/topic/skinnontumorPLC.html. Accessed December 13th, 2017.
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

Images hosted on PathOut servers:

Arms, courtesy of Mark R. Wick, M.D.

Breast skin, courtesy of Mark R. Wick, M.D.



Images hosted on other servers:

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

Images hosted on PathOut servers:

Breast skin, courtesy of Mark R. Wick, M.D.

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