Causes of Erythema Nodosum (Medical Mnemonics)

Fig 1: Erythema Nodosum

NODOOSSSUM

N	NSAIDs
O	Oral contraceptive pills
D	Darling's disease (Histoplasmosis)
O	Ohio valley disase
O	COccidiodomycosis
S	Sulphonamides
S	Strep A Haemolytic
S	Syphilis
S	Sarcoidosis
U	Ulcerative COlitis
M	Mycobacterium TB
M	RheuMatic Fever

Also Pregnancy

Further Reading | Fig 1