Scars, scars. What exactly is a scar? Scar” is a localized symptom that affects the appearance and function of the skin, caused by physical, biological and chemical damage to the soft tissues of the human skin, resulting in serious damage to the soft tissues of the skin that cannot be repaired normally by itself and is replaced by fibrous tissue. What do scars look like? In fact, there are just a few common types of scars. Generally, we classify scars into raised scars and depressed scars according to the appearance of the scar. Subdivided further, raised scars are divided into hyperplastic scars and keloid scars: depressed scars are divided into acne pits and swelling lines, etc. The following is a brief description of what the characteristics of these keloids are. I. Raised keloid scars: keloid scars and hyperplastic keloid scars are common. 1. Keloid scars. This type of keloid scar is the product of excessive proliferation of fibrous connective tissue. It protrudes from the skin surface in a verrucous proliferation with a smooth, red and shiny surface, often found with dilated capillaries extending outward. The skin is damaged to the point where the edges protrude outward beyond the original wound. Shape-shifting. A strange itching or tingling burning sensation is felt. Because of the acute pain sensation, it may be due to sensitive nerve endings or the formation of microneuromas, which can be painful even when lightly touched by clothing, etc. Scars are found on the chest, shoulders, neck, back and ears. They can occur in both men and women. 2. Proliferative scars. Most often occur in wounds where the depth of injury is only to the dermis. Most often occur after the wound of deep burns has healed. Reticular proliferative scars are also common at the sutures around the skin fragment after the implantation of a third-degree burn wound. The most common is the incisional scar after suturing of any incision. The proliferative scar appears as a protruding surface with an irregular shape and uneven elevation that does not extend beyond the original wound. It is flushed and congested and is firm and tough. There is burning pain and itching. Second, depressed scar: commonly caused by various reasons such as acne pits and swelling lines. 1. Acne, surgery, trauma, infection, chicken pox and smallpox are common causes of depressed scars. These causes lead to skin dermis and subcutaneous tissue defects, and the lack of collagen and elastin in the subsequent healing process will leave permanent depressed scars. 2. Swelling lines. It is a primary streak-like atrophy of the skin, which is light red in color at the beginning and turns to light white after a long time. No conscious symptoms. Depending on the situation, stretch marks occur in different parts of the body, stretch marks occur in the abdomen and thighs. Adolescent atrophic striae often occur on the inner femur, buttocks and posterior lumbar region. Those that occur due to corticosteroid use are seen on the medial femur and other folds. The appearance of scar formation varies depending on the cause of the scar. Different scar will have different treatment methods, but before treatment, it is important to determine which kind of scar it is, so that the doctor can prescribe the right medicine and develop the most reasonable treatment plan to achieve the best treatment effect.