Traumatic injuries to the human skin will more or less leave a scar after healing. Most people expect to have a medication or a method to make the scar disappear when it occurs. However, scarring is not as simple as one might think, but rather complex, and the types and degrees of scarring vary greatly. Even with such advances in medicine today, it is still impossible to fully understand the mechanism of scar occurrence, let alone to make them disappear. I. The natural evolution of scarring The most important factor in determining whether a scar is good or not is the degree of injury to the skin and how well the wound is treated, while the patient’s constitution and physical condition also play a part. The general principle is that the faster a wound heals, the less scarring it will have; the slower a wound heals, the more severe the scarring will be. Wounds that are first healed will have a slightly red and swollen scar, which is due to the growth of many fibers in the scar. As time passes, the fibers gradually disappear, the scar becomes flat and soft, and the color gradually recedes to white, usually called a mature scar, which usually takes about six months to a year. If the wound is more serious, or if there is an infection with inflammatory reaction, or if it takes longer to heal for other reasons, more fibrous tissue will be produced and the scar will be thicker and swollen, making it unsightly. If a hypertrophic scar is treated properly, it will still fade to some extent after a longer period of time as the scar matures. If not handled properly, it will become more severe. Some people develop another very serious type of hypertrophic scar due to their body type – a crabfoot swelling (keloid). It will grow outward beyond the initial scar and is quite troublesome to treat. The so-called ideal scar is a thin, flat, white scar that has degenerated over a long period of time and is not easily detectable if it is parallel to the skin’s pattern. Undesirable scars include wide, sunken or raised scars, long, straight scars, thick, red and swollen scars, and keloid scars. Methods to avoid undesirable scarring 1. Surgical wounds: After the stitches are removed or after the initial healing of the wound and from the beginning, apply scar patches to the wound until the scar matures in six months. 2.Trauma scars: careful treatment of wounds and careful suturing is the only way to reduce scarring, also after wound healing, the scar patch must be applied until the scar matures. 3.Burn scars: It takes about six months to one year to wear a strong elastic garment. 4. Acne: In addition to cleaning the affected area, using fruit acids and taking medication to control acne, you should avoid squeezing the acne with your hands to prevent the formation of pits and scars. Treatment of undesirable scar 1. Hypertrophic scar: Steroids can be injected directly into the scar to soften the scar and subside. Usually the injection is fixed once a month until the scar is soft and flat, and the red appearance of the scar will slowly fade and finally turn white. 2.White and wide or unpleasant scar: Scar revision surgery can be performed, including scar excision and restitching, Z- or W-shaped revision, or laser resurfacing, etc., depending on the scar condition to determine the surgery method. 3.Acne scars: laser resurfacing or resurfacing machine. 4.Burn scars: the scars are more serious and extensive, not easy to be repaired, usually only for facial and joint function parts for treatment. This includes scar excision, flap transplantation, skin tissue expander implantation, etc.