[Erythema nodosum : a panniculitis of diverse origins].

Erythema nodosum is an acute nodular panniculitis, mainly affecting young women. Diverse etiologies are evoked, but the most frequent are sarcoidosis (Löfgren syndrome), streptococcal infections, yersiniosis and inflammatory enteropathies. Antalgic drugs and rest are usually adequate in this condition, which is spontaneously of favourable evolution. Treatment of the cause is open to discussion, considering their lack of effect on the evolution of erythema nodosum.