Abstract: From September 2023 to December 2023， two patients with burn scar formation were admitted. The skin and soft tissue expander was implanted in stage I， and part of the expander balloon was exposed after surgery. In one case， the exposed area was about 5 cm×5 cm and the volume was about 50 mL， accounting for 20% of the total water injection. The exposed area of the other case is about 3 cm×2 cm， and the volume is about 20 mL， accounting for 5% of the total water injection. The causes of the exposed expander balloon were analyzed， and dressing change was given. At the same time， water injection and pressure bandaging were used to save the exposed expander balloon. In the end， 270 mL and 360 mL water were successfully injected， accounting for about 67% and 90% of the rated capacity of the skin soft tissue expander. Postoperative scar repair results were good in 2 patients， no necrosis of expanded flap， no motor and sensory dysfunction， and the patients were satisfied. The reasons for the partial exposure of the expansion balloon after the implantation of the skin and soft tissue expander are as follows： 1. Scar expansion is limited and the surrounding conditions are not sufficient， and the wound is easy to split； 2. Too long electric coagulation time leads to local full-layer necrosis of the flap， which easily leads to the exposure of the expander. The experience in the treatment of such complications： prevention and treatment of infection， external bandaging and fixation to reduce the tension of local exposed balloon. In addition， negative pressure closure and drainage can promote wound healing.

Key words: Tissue expansion devices, 　Skin transplantation, 　Complications, 　Scar contracture, 　Vacuum sealing drainage