The most common cause of cellulitis is streptococci.(1) Coagulase-nega
tive staphylococci(2) and gram-negative bacteria, such as Serratia spp
., Proteus spp., and other Enterobacteriaceae may produce cellulitis i
n the immunocompromised patient.(1) We report a case of Citrobacter di
versus-induced cellulitis, resembling streptococcal infection, in a pa
tient with multiple myeloma.