”Scars”, i.e. scarring, are changes in the appearance and histopathology of normal skin tissues caused by various traumas, which are inevitable products of the repair process of human trauma. However, excessive scar growth is a pathological manifestation that can cause complications such as “cosmetic” appearance changes and limb dysfunction. The causes of scar formation often include trauma, burns, cuts, surgical procedures, and certain inflammatory skin diseases (e.g., acne, folliculitis). Keloid scars are often divided into hyperplastic scars, keloid scars, and atrophic keloid scars, the first two of which are usually elevated above the skin surface, while the latter are depressed. In terms of treatment, hyperplastic keloid scars can be treated with laser grinding, microdermabrasion, fractional laser grinding, and external anti-scar products; keloid scars can be treated with local injection of long-acting glucocorticoids, laser, surgery, radiotherapy, or isotope dressing; atrophic keloid scars can be treated with microdermabrasion, fractional laser, and so on. In fact, the effect of single therapy is often not obvious, and the effect of combined therapy such as drug combined with laser and drug combined with surgery is better. Scar formation is a gradual and long-term pathological process, and therefore requires a continuous and adequate treatment process. It is not as simple as the advertised “one application of ointment completely eliminates”, and if not handled properly, it can cause secondary infection or even further scar growth. Therefore, it is recommended to go to a regular hospital and consult a professional doctor for reasonable and effective treatment. At the same time, early prevention of scarring is also very important. For example, early wound healing of trauma, burns or surgical procedures can be treated with appropriate topical anti-scar dressing, etc. For those who are prone to acne, do not squeeze or pick them at will. For those who are prone to scarring after injury, avoid trauma as much as possible.