Causes of Erythema Nodosum - Mnemonic



NO cause found in 60% of cases

Drugs (antibiotics e.g., sulfonamides, amoxicillin)

Oral Contraceptives 

Sarcoidosis or Lofgren's syndrome 

Ulcerative Colitis, Crohns, Bechet's  

Micro: TB

   Viral: HSV, EBV, HIV, HepB, HepC

   Bacterial: Campylobacter, Rickettsiae, Salmonella, Psittacosis, Bartonella, Syphilis

   Parasitic: Amoebiasis, Giardiasis



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