Abrasions are injuries in which the skin surface is abraded by a rough object, most commonly on the palms of the hands, elbows, knees, and lower legs. After the abrasion, the epidermis is seen to be broken and the wound surface appears pale with many small bleeding spots and tissue fluid exudation. Because the dermis is rich in nerve endings, the injury is often very painful, but the regenerative ability of epidermal cells is very strong, such as the wound is not infected will heal quickly, and can not leave scars. There are external force caused by abrasions. Including gunshot, gold blade, bruises, holding heavy injuries, falls, or by external impact, weapon injuries, etc.. Due to the action of blunt (slightly rough) mechanical force friction, resulting in epidermal peeling, rolled over as the main performance of the injury. Can be manifested as scratches, scuff marks, impact marks, indentation, indentation marks, etc., the damage is slight, but can reflect the point of action of violence, the direction of violence, the intention to inflict violence and the characteristics of the cause of injury. In the sliding direction of the friction surface to form a fine and shallow plow marks type of damage. What are the common skin abrasions? Head trauma: Scalp lacerations are mostly caused by sharp or blunt objects. The size of the fissure, depth varies, the trauma edge is neat or not, sometimes accompanied by skin contusion or defect, due to the rich vascularity of the scalp, vascular rupture is not easy to self-closing, even if the wound is small bleeding is more serious, and even shock occurs as a result. Laryngeal trauma: the result of a direct blow from violence, such as a bump from a traffic accident, a laceration from an industrial accident, a self-hanging or strangulation injury, a blow injury from a boxing or blunt instrument, etc. Different degrees of contusions can occur according to the direction of the external force, such as external force from the side, because the larynx can move to the opposite side, the injury is mild, often without fracture, only the laryngeal mucosa damage, cricoarytenoid joint dislocation, etc.. When impacted by an external force from the front, the injury is often more serious, producing a longitudinal fracture in the middle of the thyroid cartilage, a fracture in the posterior part of the cricoid cartilage and an injury to the mucosa in the larynx. Ocular trauma: In production, life and sports, shock waves from masonry, earth, fists, balls, falls, traffic accidents and explosions (such as firecrackers) are common causes of blunt contusions of the eye. When blunt force strikes the eye, it can produce direct injury at the site of the blow, and because the eye can be viewed as an incompressible sphere, blunt force can be transmitted within the eye and the wall of the eye, causing multiple indirect injuries. This is primarily a concept of blunt contusion. Sports skin abrasions: During sports, the skin is relatively dry and dehydrated, and also prone to sweating. Skin abrasions occur when the protective layer of the skin surface comes in contact with clothing due to friction. And hot and humid weather, larger body size are the cause of skin abrasions. After the abrasion, if the abrasion site is shallow, just apply red saline; if the abrasion wound is dirty or there is oozing blood, apply saline to clear the wound and then apply red saline or purple saline.