(1) Superficial scars: They are more common after abrasions and shallow burns. They are characterized by a slightly rough appearance, pigment changes, local flatness and softness, no functional impairment, and generally do not require treatment.

(2) Hypertrophic scars: Also known as hypertrophic scars, they are more common after deep second-degree and superficial third-degree burns and thick and medium-thickness skin graft donor areas heal on their own. It is characterized by being thick (up to 1-2 cm) and hard, red or dark purple in color, painful and itchy, and often affects work and rest. After about 6 months, the scar gradually becomes softer and slightly flatter, the congestion subsides, the capillaries decrease, and the itching and pain symptoms gradually reduce or disappear.

(3) Atrophic scars: Also known as unstable scars, they are common after electric shock injuries to the head and skull, and after large-area burns and chronic ulcers heal. Scars are hard, have few local blood vessels, are light red or white in color, have tight adhesions in deep tissues, and cannot tolerate friction and weight-bearing. Ulcers often remain unhealed for a long time and can lead to malignant transformation in the late stages.

(4) Contracture scars: They are more common in deep burn wounds that are allowed to heal on their own without skin grafting. They often seriously damage functions, such as ectropion, lip ectropion, geniothoracic adhesions, and flexion of various joints. Contracture deformity. Long-term scar contracture can affect the development of muscles, tendons, and nerves, causing joint stiffness, dislocation, and deformity.

(5) Keloid: Also known as keloid, it is a mass formed by connective tissue. It often develops after burns, injuries, or minor injuries that go unnoticed by the patient. The edge of the scar is significantly higher than the skin and exceeds the scope of the original lesion. It is pink or purple, extremely hard, inelastic, and has poor blood supply. Keloid scars are particularly common on the upper part of the body. The head, neck, center of the sternum, shoulders and upper arms are common sites, while the eyelids, areola and penis are rare sites.

(6) Webbed scar: The scar is wrinkled and looks like a duck web. These scars are most common from burns and occasionally from cuts and tears in the skin and improperly placed surgical incisions. Large webbed scars are mostly found on the front of the neck, armpits, antecubital fossa and perineum. Small ones are common on the inner and outer canthus, nasolabial folds, corners of the mouth, nostrils, palm sides of fingers, finger webs, tiger's mouth, urethral opening, vaginal opening and other places.

In addition, there are types of depressed scars, bridge scars and linear scars.