[Pyoderma gangrenosum in a grade 3 open fracture after a forest accident : When one cannot see the wood for the trees].

We describe the case of a forest worker with a Gustilo-Anderson III dislocation fracture of the ankle joint. After initial external fixation, round necrotic skin lesions with hyperemic border walls appeared on the entire lower leg. Recurrent débridements worsened the soft tissue instead of improving it. An immunoglobulin and corticosteroid treatment was initiated, which diminished the inflammatory reaction and granulation of soft tissue began. Posttraumatic pyoderma gangrenosum is a rare diagnosis. Nevertheless, it needs to be on the list of differential diagnoses if uncommon soft tissue reactions appear.