Mesenchymal Stem Cell-derived Pleiotropic Factor in Treating Poorly Healed Wounds of Postoperative Incision

Inclusion Criteria: 1. Wound size \<10X10cm2, the wound base only involves subcutaneous and muscle tissue； 2. Underwent surgical treatment, all incisions were type I, and the incisions healed poorly and delayed healing after 1 week； 3. There is inflammatory reaction at the incision, but no clear indication of infection, or severe infection of the incision.After debridement and dressing change, the infection is controlled and the fresh granulation period is entered 4. Men or women older than 17 years old and younger than 75 years old; 5. Psychologically stable, able to complete the test process. Exclusion Criteria: 1. Wound size\>10X10cm2, the wound base is as deep as the chest and abdominal cavity, causing infection or osteomyelitis in the chest and abdominal cavity; 2. Surgical incision with purulent infection, local purulent secretions can be seen; 3. Those with obvious body temperature and white blood cell elevation, local purulent secretions have positive bacterial culture; 4. Patients with diabetes; 5. Glucocorticoid users; 6. Patients with immune dermatosis; 7. Neoplastic wounds, such as wounds after skin cancer resection, or skin wounds caused by tumor invasion; 8. Psycho-psychological disorders and poor compliance.