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 C17 Skin and Connective Tissue Diseases D017437 +
  C17.800 Skin Diseases D012871 +
   C17.800.174 Dermatitis D003872 +
    C17.800.174.600 Drug Eruptions D003875 +
     C17.800.174.600.375 Erythema Nodosum D004893 

 C17 Skin and Connective Tissue Diseases D017437 +
  C17.800 Skin Diseases D012871 +
   C17.800.229 Erythema D004890 +
    C17.800.229.413 Erythema Nodosum D004893 
      C17.800.229.413.800 Sweet's Syndrome D016463 

 C20 Immunologic Diseases D007154 +
  C20.543 Hypersensitivity D006967 +
   C20.543.206 Drug Hypersensitivity D004342 +
    C20.543.206.380 Drug Eruptions D003875 +
     C20.543.206.380.375 Erythema Nodosum D004893 

 C21 Disorders of Environmental Origin D007280 +
  C21.613 Poisoning D011041 +
   C21.613.276 Drug Toxicity D004362 +
    C21.613.276.505 Drug Eruptions D003875 +
     C21.613.276.505.375 Erythema Nodosum D004893