Nicolau Syndrome: three cases and review.

Nicolau Syndrome, also known as livedo-like dermatitis (LLD) or embolia cutis medicamentosa (ECM) is an infrequent complication following intramuscular and intra-articular injection of various drugs. This rare entity is characterized by severe pain and erythematous-ecchymotic reticular lesions at the injection site, which in many cases lead to necrotic ulcers and scarring. We report three cases of Nicolau Syndrome following injection of diclofenac, penicillin G, and cyanocobalamin.