Codes

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
• Riehl melanosis
• 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 hyperpigmentation

Best Tests

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Management Pearls

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Therapy

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References

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