In the treatment of highly malignant skin tumors postoperative radiotherapy may be indicated after wound closure.In the University Hospital Carl Gustav Carus Dresden, Germany, a retrospective study of 75 patients, who received postoperative radiotherapy after wound closure, was conducted. In all 75 patients (56 male, 19 female), radical doses of irradiation (40-70 Gy in 20-35 fractions) were administered. The median time interval between surgery and radiation therapy was 7 weeks (range 3-48 weeks). The incidence of wound healing complications (WHCs) increased after radiotherapy (p<0.001). Univariable analysis showed that WHCs were associated with immunosuppression (p=0.002), split thickness skin graft (p=0.007) lymphoma or leukemia (p=0.032) and diabetes mellitus (p=0.046). Multivariable logistic regression showed that independent risk factors for WHCs were split thickness skin transplantation (odds ratio: 3.85, 95% confidence interval (CI): 1.13-13.1, p=0.031) and immunosuppression (odds ratio: 4.69, 95% CI: 1.18-18.7, p=0.029). The authors observed no association between surgical site infections and WHCs (p=1.0). Univariable analysis showed that SSIs were associated with leukemia or lymphoma (p=0.019). Together, the results show an increased incidence of WHCs after radiotherapy. Other conditions associated with WHCs were leukemia or lymphoma and diabetes mellitus. Immunosuppression and split thickness skin transplantation were independent risk factors for WHCs.