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Genetic and Rare Diseases Information Center (GARD)

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Pityriasis lichenoides chronica


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Overview

What is pityriasis lichenoides chronica?

What are the symptoms of pityriasis lichenoides chronica?

What symptoms are associated with pityriasis lichenoides chronica (PLC)?

What is pityriasis lichenoides chronica?

Pityriasis lichenoides chronica is the mild, chronic form of pityriasis lichenoides, a skin disorder of unknown cause. This condition is characterized by the gradual development of symptomless, small, scaling papules that spontaneously flatten and regress over a period of weeks or months. Lesions at various stages may be present at any one time. Patients with this condition often have exacerbations and relapses of the condition, which can last for months or years.[1]
Last updated: 4/30/2010

What are the symptoms of pityriasis lichenoides chronica?

Pityriasis lichenoides chronica usually starts out as a small pink papule that turns a reddish-brown color. There is usually a fine, mica-like adherent scale attached to the center which can be peeled off to reveal a shiny, pinkish brown surface. Over several weeks, the spot flattens out spontaneously and leaves behind a brown mark, which fades over several months. Pityriasis lichenoides chronica most commonly occurs over the trunk, buttocks, arms and legs, but may also occur on the hands, feet, face and scalp. Unlike the acute type of pityriasis lichenoides, lesions associated with pityriasis lichenoides chronica are not painful, itchy or irritating.[1]
Last updated: 4/30/2010

What symptoms are associated with pityriasis lichenoides chronica (PLC)?

PLC is the milder form of pityriasis lichenoides, and the lesions associated with this form consist of small, firm, red-brown spots. Unlike PLEVA, the lesions are not irritating and have mica-like adherent scale, which can be scraped off to reveal a shiny brown surface. The spot flattens out over several weeks to leave a brown mark which fades over several months. PLC can look like psoriasis, lichen planus, or insect bites.[2]
Last updated: 7/19/2013

References
  1. Pityriasis lichenoides. DermNet NA. February 2010; http://dermnetnz.org/scaly/pityriasis-lichenoides.html. Accessed 4/30/2010.
  2. Pityriasis lichenoides. British Association of Dermatologists Web site. August 2004; http://www.bad.org.uk/site/855/default.aspx. Accessed 4/29/2010.


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