Definition

• A tender, violaceous, nodular rash on the extensor surfaces of lower extremities that often arises in conjunction with:
  • Infection (particularly Streptococcus and tuberculosis)
  • Inflammatory bowel disease
  • Occult neoplasms
  • Sarcoidosis
  • Behçet’s disease
  • Pregnancy
  • Certain medications
• Biopsies of the rash reveal inflammation of subcutaneous fat (panniculitis).

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