[Facial necrosis caused by orthopoxvirus : Differential diagnosis and dermatohistopathological correlation of infectious facial ulcers].

This article reports the remarkable course of a facial ulcer in a patient receiving prednisolone for Crohn's disease. Based on the initially unclear origin of the ulcer the patient received a triple anti-infective treatment (antiviral, antibiotic, antimycotic) but the lesion showed a rapid progression. An orthopoxvirus infection could be verified later by extensive diagnostics and relevant differential diagnoses could be ruled out. Extensive necrotic changes were observed in the first weeks resulting in cicatricial healing after months. Human cowpox infections have been repeatedly reported in Germany and are a relevant zoonosis. Cats and rodents are main carriers. The differential diagnoses include infections caused by other bacterial, mycobacterial, mycotic and parasitic agents that are thoroughly discussed here both clinically and histopathologically. Especially cutaneous leishmaniasis must be named as the incidence is continuously rising. With inadequate treatment infectious facial ulcers may give rise to life-threatening complications and extensive disfiguring scarring, therefore treatment must be initiated in a timely manner.