Cutaneous reactions to vitamin K1 injections.

Cutaneous reactions to vitamin K1 injections are reported infrequently. Most previously reported cases have been associated with liver disease, primarily alcoholic cirrhosis and viral hepatitis. Four new cases are reported. One patient had polycythemia vera and the Budd-Chiari syndrome, the second such report in the literature. The other three patients had no known hepatic disease. The reactions consisted of erythematous plaques at the injection site without progression to sclerodermatous plaques. Histopathologic examination in three cases showed spongiotic changes and mononuclear infiltrates typical of cutaneous reactions to vitamin K1. In one instance a neutrophilic infiltrate was associated with the reaction site. Our findings support the observation that liver disease is not a necessary condition for the occurrence of vitamin K1 hypersensitivity.