Scar proliferation is the result of fibroblast proliferation during the wound repair process. We often see scars that look like “caterpillars”, which are scary and unattractive, and do not look good in a swimsuit in summer. The common skin surgeries we have are pigmented moles, lipomas, pink tumors, skin cancer and various skin swellings. Nowadays, the dermatology departments of major hospitals mainly focus on the treatment of diseases, in short, surgical treatment, while the cosmetic effect does not attract attention. Of course, this has to do with the fact that dermatology surgery is inexpensive and cannot take as much time and effort as cosmetic surgery. However, the cost of surgery in plastic surgery is high and sometimes the nature of the lesions cannot be correctly determined, so most patients choose to come to dermatology for surgery and require post-operative pathological examination to achieve both treatment and diagnostic purposes. As the economic level improves, more and more patients have higher requirements for aesthetics, and even some elderly people and patients who have skin biopsies also have a demand for aesthetics. Therefore, as a dermatologist, we should also pay attention to the prevention of postoperative scars. By site, the face and neck have the least tension and are the least likely areas for scar formation. The chest and back, on the other hand, have high tension and are the most prone to scar growth. In short, the lower the tension, the smaller the scar. In terms of sutures, the thicker the suture, the larger the scar, the thinner the suture, the smaller the scar, and the smaller the distance between the eye of the suture and the incision, the smaller the scar. Intermittent suturing can be done with fine thread for the face and thicker thread for the chest and abdomen. It is important to choose the right thread considering the tension and site. Intradermal sutures are the best way to avoid scars. After the subcutaneous sutures, the epidermis can be closed with fine threads. Intradermal sutures are self-absorbing, while sutures for superficial sutures need to be removed. There are also medical glues that can be used to directly stick to the wound without removing the sutures, but the cost is higher. Of course, postoperative care is also important, 1-2 days after surgery to change the medication, generally 5-6 days to remove the stitches on the face, 7-9 days on the chest and abdomen, 10-12 days on the extremities, the possibility of leaving scars for a long time to remove the stitches, but also according to the wound situation. Before the removal of the stitches, we should pay attention to avoid wound infection, it is best to disinfect the wound for 1-2 days to change the medication, especially for people who are prone to oil on the face. Also pay attention to avoid getting wet, not drinking alcohol and not eating spicy and stimulating food. After the removal of the stitches, use the medication to remove the scars. Do not do strenuous exercise for one month after surgery, especially for chest and back surgery, otherwise the wound will be easily opened.