Skin nontumor
Pigmentary disorders
Linear and whorled nevoid hypermelanosis

Topic Completed: 1 April 2013

Minor changes: 17 May 2019

Copyright: 2002-2019,, Inc.

PubMed Search: Linear and whorled nevoid hypermelanosis<

Christopher S. Hale, M.D.
Page views in 2019: 608
Page views in 2020 to date: 183
Cite this page: Hale CS. Linear and whorled nevoid hypermelanosis. website. Accessed May 30th, 2020.
Definition / general
  • Rare skin disorder, often in first weeks of life, with swirls and streaks of macular hyperpigmentation along lines of Blaschko (Wikipedia)
  • Usually not associated with other abnormalities (Pediatr Dermatol 2007;24:205)
Diagrams / tables

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Lines of Blaschko

Clinical features
  • Swirls and whorls of hyperpigmented macules in reticulate pattern along Blaschko lines
Case reports
  • No satisfactory treatment
Clinical images

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Whorled pattern over trunk (fig. 2)

Macular hyperpigmentation

Microscopic (histologic) description
  • Epidermal melanosis
  • No pigment incontinence or melanophages
Microscopic (histologic) images

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Epidermal hypermelanosis

Diffuse melanosis (fig. 1)

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