Heavy abrasions can not be used: 1, can not be applied to red mercury or gentian violet, etc., in the mucous membrane surface of the skin to form a layer of protective film of the drug, because after severe abrasions due to the tissue fluid will ooze out, if the surface to form a layer of protective film, there is a possibility that the tissue fluid will be collected in the surface of the wound, which can easily lead to bacteria, viruses or other microorganisms on the surface of the wound to breed, and the emergence of wound infection. 2, Heavy abrasions can not expose the wound, must be covered with petroleum jelly gauze block, and then bandaged with sterile dressings. Many people think that the wound is exposed to the air after the abrasion, easy to promote the formation of scabs, but severe abrasions due to the wound is deeper, if you do not bandage the wound is likely to lead to bacteria, viruses and microorganisms on the surface of the wound breeding and aggravate the infection. 3, severe abrasions should not be able to get into the water, because the water also has a lot of bacteria and viruses, but also very easy to induce infection.