This study is designed to evaluate the effect of fetal fibroblast on partial thickness wound healing. It is a double blind, randomized clinical trial which will be done on 10 patients who need skin graft surgery. Fetal fibroblast preparation: [Inclusion criteria are pregnant women, who are older than 18 years old and must have abortion, aborted fetus with age of 11 to 14 weeks, and filling out the informed consent. Exclusion criteria included pregnant women who are younger than 18 years old, aborted fetus younger than 11 weeks or older than 14 weeks, infectious diseases (HIV-HBV-HCV) and consumption of immune-suppressive drugs. After selecting the appropriate fetus, a 10×10 specimen of skin will be harvested and sent to Royan Institute for fibroblast isolation and culture. Clinical part of the trial has the following inclusion criteria: patients with age of 20 to 60 years old, those who need skin graft surgery, filling out the informed consent. Its exclusion criterion is co-morbidity. After harvesting skin graft, three 5×5 cm areas will be selected in lateral, anterior and medial parts of donor for examination. One of these areas will be randomly covered with acellular amnion loaded with fetal fibroblast; the second part will be covered with acellular amnion and the third one with Vaseline gauze. The surgeon who is dressing the wound is blind about type of the amnion. Speed of wound healing, pain, infection, scar and pathologic criteria of all the patients will be compared.