Indian Journal of Dermatology (Jan 2021)

Porokeratosis ptychotropica: Dermoscopy, reflectance confocal microscopy, and histopathological correlation

  • Francesco Lacarrubba,
  • Maria Letizia Musumeci,
  • Anna Elisa Verzì,
  • Claudia Poma,
  • Rosario Caltabiano,
  • Giuseppe Micali

DOI
https://doi.org/10.4103/ijd.ijd_894_20
Journal volume & issue
Vol. 66, no. 5
pp. 540 – 542

Abstract

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Porokeratosis ptychotropica (PP) is a rare variant of porokeratosis characterized by pruritic, symmetrical, red-brown verrucous papules, and plaques most commonly localized within the gluteal fold. Herein, we report the clinical, dermoscopy, and reflectance confocal microscopy (RCM) aspects of a case of PP in a 63-year-old Caucasian woman along with histopathological correlation. Both dermoscopy and RCM were able to recognize the cornoid lamella, the histopathological clue shared by all clinical variants of porokeratosis. These non-invasive techniques may help in the differential diagnosis with other inflammatory/infectious and neoplastic disorders that may clinically resemble PP, but show distinct patterns.

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