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Terra firma-forme dermatosis.

Andrea Sechi1, Annalisa Patrizi1, Francesco Savoia1

  • 1Division of Dermatology, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy.

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Terra firma-forme dermatosis is an acquired skin pigmentation disorder due to keratinocyte retention. Prompt regression with alcohol-soaked gauze confirms diagnosis and provides treatment for this underreported condition.

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Area of Science:

  • Dermatology
  • Acquired Pigmentation Disorders

Background:

  • Terra firma-forme dermatosis is an underreported acquired pigmentation disorder.
  • It is characterized by asymptomatic hyperpigmented patches or velvety plaques.
  • This condition can affect any body part, commonly seen in skin folds.

Purpose of the Study:

  • To describe the clinical characteristics of Terra firma-forme dermatosis.
  • To highlight its diagnostic and curative features.
  • To discuss potential contributing factors.

Main Methods:

  • Clinical observation and patient history.
  • Diagnostic confirmation via alcohol-soaked gauze rubbing.
  • Literature review on underreported dermatoses.

Main Results:

  • The condition presents as asymptomatic hyperpigmented patches/plaques.
  • It affects all age groups equally, with higher prevalence in children (mean age 10.4 years).
  • Complete regression occurs promptly after rubbing with alcohol-soaked gauze.

Conclusions:

  • Terra firma-forme dermatosis is a distinct entity caused by keratinocyte retention.
  • Alcohol-soaked gauze is both diagnostic and curative.
  • While the exact cause is unknown, poor hygiene or atopy may be contributing factors.