Codes

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Diagnostic Pearls

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Differential Diagnosis & Pitfalls

• Pigmented purpuric dermatoses 
• Postinflammatory hyperpigmentation 
• Lichen planus pigmentosus – Most commonly affects sun-exposed areas including the face and neck.
• Ashy dermatosis – Typically presents as gray-blue macules and patches affecting the trunk and proximal extremities.
• Drug-induced pigmentation 

• Sneddon syndrome
• Cutaneous or systemic polyarteritis nodosa – Typical presentation includes tender subcutaneous nodules with possible ulceration.
• Granulomatosis with polyangiitis
• Connective tissue diseases (systemic lupus erythematosus, rheumatoid arthritis, dermatomyositis)
• Hematologic or hypercoagulable conditions (antiphospholipid antibody syndrome, cryoglobulinemia, essential thrombocythemia, polycythemia vera, protein C or S deficiency, disseminated intravascular coagulopathy)

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Management Pearls

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Therapy

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References

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