Abstract
P o l i a rthralgias can be caused by different illnes ses with very variable etiology and pro g n o s i s . Sometimes these illnesses are associated with cuta neous lessions, that can help us in the diagnosis of the process. Erythema nodosum can be the initial clinical manifestation of diverse patologies. It is characterized by the presence of erythematous and painful subcutaneous nodules, from 1 to 5 centime ters in diameter, with important inflamation compo nent, preferably situated in the pretibial surface of the inferior extremities. The association with bila teral hiliar adenopathies is known as the Lofgre n ’s s y n d rome, a kind of acute sarcoidosis with very good prognosis and spontaneous remissions in most cases.
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