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Diseases

Genetic and Rare Diseases Information Center (GARD)

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Pityriasis rotunda


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Cause

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What causes pityriasis rotunda?

The exact cause of pityriasis rotunda is unknown, but some researchers believe that it may be a variant of ichthyosis vulgaris.[1][2] Other researchers believe that pityriasis rotunda is caused by malnutrition, but this is not universally accepted. The presence of systemic disease, which is characteristic of type 1 pityriasis rotunda, appears to be most common in South African and Japanese individuals, but is less common among Caucasians.[2] Type 1 most often occurs with stomach cancer and liver cancer. Other conditions that type 1 pityriasis rotunda has been associated with include:[1][2]
It has been proposed that type 2 pityriasis rotunda, which is typically inherited in families and seen in lighter skinned individuals, is inherited in an autosomal dominant manner.[1]
Last updated: 1/19/2012

References
  1. Pityriasis rotunda. DermNet NZ. December 29, 2013; http://dermnetnz.org/scaly/pityriasis-rotunda.html. Accessed 6/3/2014.
  2. Rao J. Pityriasis rotunda. Medscape Reference: Treatment & Management. March 3, 2014; http://emedicine.medscape.com/article/1107624-treatment. Accessed 6/3/2014.


See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.