This study is designed to evaluate effects of stem cells on healing skin graft donor sites and third degree burn wounds. It is a randomized, clinical trial, which will be done on 20 patients (10 skin graft and 10 burn patients). These patients' inclusion criteria include: age of 18 – 60 years old, who require skin graft surgery, or those who have third degree burn of less than 10% of TBSA. Exclusion criteria include: having co-morbidity. In all the patients, 30 ml of fat will be suctioned from the abdominal area under local anesthesia. Its stem cells will be then separated and cultured. Cell characteristics will be determined after appropriate passage. Afterwards, these stem cells will be transferred to amnion, which become acellular enzymatically. The skin graft donor wound in thigh will be divided to medial, lateral and middle parts. Then, each part will be randomly covered by 1- acellular amnion loaded with stem cell, 2- acellular amnion and 3- Vaseline gauze. In the second group of patients, burning scar will be removed during the surgery. Wound site will be divided to three parts and covered in a similar fashion to the first group. Healing speed of the wounds, characteristics of scar and histopathology criteria will be compared with each other.