Types of keloid scars are often clinically classified into the following types: 1. Superficial keloid scars are often formed after mild abrasions, superficial infections or superficial second degree burns, except for the slight difference in color and luster from normal skin, the local flatness and softness, and sweating function are not affected, so no further treatment is needed. If the scar involves deep tissues such as muscles, tendons and periosteum, the base of the scar is often tightly adhered and can affect functional activities. 3, atrophic scars These scars are mostly seen after self-healing burns in early childhood, after a long time the scar has matured and softened, and further atrophied, the surface is smooth and flat, hypopigmentation or loss of pigmentation and presents lumps of white, or pigmentation in dark brown, or both colors exist at the same time, the central white surrounding brown, atrophic scar texture soft base is loose can be mentioned, atrophic scar can be seen in all parts of the body, to The atrophic scar can be seen in all parts of the body, but the face is the most common, generally stable and without obvious dysfunction, which seriously affects the beauty of the face and is the reason for treatment. 4.Proliferative scar, also called hypertrophic scar, usually occurs after the healing of deep second-degree burn wounds, also seen in the deep second-degree burn residue around the third-degree burn wound implants, this scar often appears 1-3 months after the wound healing, the original flat wound surface, the first flushing, scratching, followed by local gradual elevation to form an irregularly shaped, tight and hard scar, the surface capillary congestion is The above situation is gradually aggravated and can last for half a year or 2-3 years, during which contracture deformity can occur. This is the main difference with keloid scars. 5. Contracture keloid is common in deep burns and in easily movable joints or loose parts of the face and neck, where the trauma heals on its own with centripetal contraction of the trauma edge, growth of the surrounding epithelium toward the center of the trauma, and the surrounding skin is pulled and driven toward the center of the trauma. However, after the wound has healed, the contracture will be removed. However, after the wound has healed, the contracture scar is no longer able to expand. Therefore, there are two types of contracture scars: primary and secondary, the former is formed during the healing of the trauma, while secondary contracture is caused by myofibroblasts in the proliferating scar tissue after the trauma has healed, which can lead to continued contraction of the scar, and sometimes the contracture can be further aggravated by external irritation, foreign bodies, infectious factors or repeated breakage at the joint activity site. 6, keloid scarring is a progressive high growth scar tissue, with benign tumor growth characteristics, some people believe that keloid scarring is related to body-specific qualities, as long as the slightest injury can form keloid, some people believe that it is related to family genetics or related to race, colored people are more common than white people, black people have the highest incidence (some statistics say it can be 6-9 times higher). Local factors such as trauma, inflammation, foreign body irritation, and excessive local tension can all contribute to the formation of keloids. The keloid has a different shape and is a verrucous proliferation above the skin, and the edges of the skin can gradually spread outward and invade areas that were not burned or damaged like a crab’s foot. The texture is hard and cartilage-like and may be itchy or painful and burning. There is usually no possibility of self-healing. Keloid scars are common on the chest, shoulders, neck, back, and earlobes, but are rare on the eyelids, palms, feet and plantars, and external genitalia.