Reactive annular erythema after intramuscular vitamin K

We present a case of a 70-year-old woman who received multiple intramuscular vitamin K injections before undergoing an invasive diagnostic procedure. Four weeks later she noted enlarging annular erythematous plaques at the sites of each injection. Although this occurrence has been recognized in the European literature, it either occurs less frequently in the United States or is not commonly reported. This is the second case report in the English literature.