1. Epidermal abrasions – generally caused by falls and collisions. Human skin is divided into the epidermis (in the outermost layer), under the epidermis is the dermis, containing rich blood vessels and nerves, and then under the subcutaneous tissue. A graze on the outermost layer of the epidermis will not bleed a lot, but it is more painful. Minor epidermal abrasions, if the wound is very clean, apply some tincture of iodine to protect the local area from infection, and let it dry naturally. If the abrasion area is relatively large, or the wound is stuck with dirt and other unclean things, can be used to cool boiled water or 2-3% of the saline rinse clean, and then coated with tincture of iodine. If the wound is stuck with broken glass, metal shavings, etc., rinsing is not clean when to go to the hospital. 2, skin laceration injury, mostly due to fall, hit the serious epidermis, dermis all torn. The wound is not neat and irregular. Most of these wounds bleed more, generally should not be dealt with, but first to stop bleeding by pressure, and then quickly sent to the hospital to clean up the suture treatment. When pressing to stop bleeding, use sterilized gauze or clean handkerchiefs, towels, etc. to cover the bleeding place of the wound and press. Do not use sand, tooth powder, flour, etc. to sprinkle on the wound, because all these things can bring bacteria into the wound and make the wound infected with pus. If the bacteria into the blood to the whole body, can cause sepsis, the consequences are very serious. 3, cuts and stab wounds, mostly due to children playing with knives, scissors, needles and other sharp objects, or playing with each other with sharp objects to injury. Can hurt the epidermis, dermis. If cut large blood vessels can bleed a lot, the general wound is more neat, clean. Treatment: first of all, stop bleeding. The simplest way is to stop bleeding by compression. With sterilized gauze or clean handkerchief, tightly press the bleeding place can stop bleeding. You can also apply Yunnan Baiyao to the wound and press for a few moments. After stopping the bleeding, use “band-aid” adhesive. If the wound is not deep, it can be healed by applying povidone-iodine after stopping the bleeding and not using it as a sticking treatment. If the wound is deep, go to the hospital for a tetanus shot. Tetanus bacteria is a kind of anaerobic bacillus, easy to grow and multiply in the deep part of the wound. If an unclean needle brings tetanus bacteria into the cotton of the wound door, it will cause tetanus, and the consequences are unimaginable. If the cut, the wound is larger and deeper, you should also go to the hospital for suture treatment.