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Diseases

Genetic and Rare Diseases Information Center (GARD)

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Linear and whorled nevoid hypermelanosis


Other Names for this Disease

  • Linear and whorled hypermelanosis
  • LWNH
  • Nevoid hypermelanosis, linear and whorled
  • Reticulate hyperpigmentation of Iijima
  • Zebra-like hyperpigmentation
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Your Question

Why isn't there more documentation regarding linear and whorled nevoid hypermelanosis?

Our Answer

We have identified the following information that we hope you find helpful. If you still have questions, please contact us.

Why isn't there more documentation regarding linear and whorled nevoid hypermelanosis?

While there is not a calculated incidence or prevalence for linear and whorled nevoid hypermelanosis (there is no official method for tracking rare conditions), the condition appears to be very rare given the few case reports that have been described in the medical literature. The condition usually happens as a chance occurence in a family. In total, around 45 cases have been described in the medical literature worldwide.[1][2] The rare occurance of linear and whorled nevoid hypermelanosis is one reason why data and information regarding the condition is lacking. Rare conditions can present an especially challenging situation. Since some conditions are so rare, there are few cases to learn from, let alone conduct research.
Last updated: 3/18/2013

References
Other Names for this Disease
  • Linear and whorled hypermelanosis
  • LWNH
  • Nevoid hypermelanosis, linear and whorled
  • Reticulate hyperpigmentation of Iijima
  • Zebra-like hyperpigmentation
See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.