Arthus reaction

• Facts:
  Intradermal injection of antigen induces antibodies, which form antigen-antibody complexes in the skin
• History / PE:
  Edema
  Necrosis
  
• See Also:
  Serum sickness
  Type 3 hypersensitivity reaction
• Associated With:
  Hypersensitivity pneumonitis
  Thermophilic actinomycetes