Recurrent erythema nodosum: a red flag sign of hidden systemic vasculitis.

Takayasu's arteritis is a rare, systemic vasculitis with varied presentations across multiple medical specialities. Here, we present a young woman who had recurrent episodes of erythema nodosum on the background of a low-grade fever and no vascular manifestations. The presence of a high erythrocyte sedimentation rate generated a high index of suspicion for underlying vasculitis, and radioimaging confirmed the suspicion of Takayasu's arteritis. The patient was found to have type III diseases in the vasculitic stage and was managed with systemic corticosteroids.