Syphilis--still a cause of erythema nodosum.
D000328:Adult; D001132:Arm; D004893:Erythema Nodosum / Q000209:etiology*; D006801:Humans; D007866:Leg; D008297:Male; D013587:Syphilis / Q000150:complications*; D013591:Syphilis, Cutaneous / Q000150:complications*