Wound growth of new flesh usually begins on the 2nd day after wounding. Twenty-four to 48 hours after the wound, the epithelial cells at the wound margin began to proliferate, and the basal cells detached from the dermis and migrated toward the defect area, and mitosis was visible. At the same time, fibroblasts as well as myofibroblasts appeared at the wound site, and neovascular capillaries grew from small veins near the injury site. The growth rate of the new capillary branches was about 0.1 to 0.6 mm per day, and the granulation tissue formed by the proliferating fibroblasts and new capillaries had the function of repairing the defect. Three to five days after injury, the wound edge begins to contract toward the center, which is used to eliminate the trauma and restore the continuity of the organism’s tissues. As the healing process progresses, fibroblasts and capillaries gradually decrease, collagen fibers continue to increase, and finally transform into scar tissue.