Concurrent development of spontaneous pyomyositis due to Staphylococcus epidermidis and Kikuchi-Fujimoto disease.

Staphylococcus epidermidis is a common cause of infections associated with prosthetic devices and immunocompromised patients. Spontaneous pyomyositis due to the above pathogen is very uncommon. Kikuchi-Fujimoto disease (KFD) is a subacute necrotizing lymphadenitis, first described in Japan.