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SynopsisCodesLook ForDiagnostic PearlsDifferential Diagnosis & PitfallsBest TestsManagement PearlsTherapyReferences
Idiopathic eruptive macular pigmentation
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Idiopathic eruptive macular pigmentation

Contributors: David O'Connell MD, Susan Burgin MD
Other Resources UpToDate PubMed

Synopsis

Idiopathic eruptive macular pigmentation (IEMP) is an acquired pigmentation of unknown etiology affecting primarily children and adolescents. It presents as asymptomatic, discrete, brown or black macules on the neck, torso, and proximal extremities. It has been reported to occasionally involve the face. Lesions develop without a history of preceding inflammation and tend to completely resolve over months to years.

Codes

ICD10CM:
L81.8 – Other specified disorders of pigmentation

SNOMEDCT:
271756005 – Macular eruption

Look For

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Diagnostic Pearls

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Differential Diagnosis & Pitfalls

  • Lichen planus – usually pruritic with an inflammatory stage and a different distribution
  • Ashy dermatosis – subtly raised inflammatory border
  • Fixed drug eruption – history of drug ingestion
  • Lichenoid drug eruption – a symptomatic eruption; look for a drug history
  • Pigmented contact dermatitis
  • Macular Urticaria pigmentosa – urticates when stroked, has increased mast cells
  • Postinflammatory hyperpigmentation
  • Acanthosis nigricans – may resemble the acanthotic papillomatous variety of IEMP
  • Tinea versicolor
  • Drug-induced pigmentation

Best Tests

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Management Pearls

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Therapy

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References

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Last Reviewed:08/11/2019
Last Updated:10/11/2022
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Idiopathic eruptive macular pigmentation
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A medical illustration showing key findings of Idiopathic eruptive macular pigmentation
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