Dermoscopic patterns of terra firma-forme dermatosis

Dermatol Online J. 2020 May 15;26(5):13030/qt6j78216z.

Abstract

Terra firma-forme dermatosis is a relatively common but probably underestimated entity characterized by asymptomatic cutaneous pigmentation resembling dirty skin. Dermoscopy is a non-invasive diagnostic tool used in the diagnosis of many cutaneous conditions. In this study we aimed to reveal dermoscopic patterns of the entity. A total of 10 patients diagnosed with terra firma-forme dermatosis were enrolled. The most common dermoscopic pattern was polygonal brown clods arranged in a mosaic pattern (N=7). The other patterns observed were seborrheic keratosis-like pattern (N=2) and perifollicular hyperpigmentation (N=1). Rubbing with 70% ethyl alcohol resulted in complete resolution of the lesions in all patients.

Publication types

  • Case Reports

MeSH terms

  • Adolescent
  • Adult
  • Dermoscopy*
  • Diagnosis, Differential
  • Ethanol / therapeutic use
  • Female
  • Humans
  • Hyperpigmentation / diagnosis
  • Hyperpigmentation / pathology*
  • Hyperpigmentation / therapy
  • Keratosis, Seborrheic / pathology
  • Male
  • Young Adult

Substances

  • Ethanol