Extrapharyngeal infections caused by Corynebacterium ulcerans have rarely been 
reported previously, and diphtheria toxin production has usually not been 
addressed. This case demonstrates that strains of C. ulcerans that produce 
diphtheria toxin can cause infections of the skin that completely mimic typical 
cutaneous diphtheria, thereby potentially providing a source of bacteria capable 
of causing life-threatening diseases in the patient's environment. Therefore, it 
is recommended to screen wound swabs for coryneform bacteria, identify all 
isolates, carefully assess possible toxin production, and send questionable 
strains to a specialist or a reference laboratory.