Fingernail cut by knife needs to be treated as follows: the first point, control the bleeding by pressing the artery with the fingers through the bone surface of the area of co-pressure to achieve the purpose of hemostasis. The second point, local use of iodophor solution to disinfect, three times after the use of hydrogen peroxide to rinse the wound to prevent anaerobic infection, while controlling bleeding. The third point, local use of gauze for pressure bandage to control bleeding, the pressure should be uniform and the range should be large enough. Fourth point, if the pain is still more obvious, you can take oral treatment with tylenol tablets, an anti-inflammatory drug that is antipyretic and analgesic, which is good for relieving pain. The fifth point, if the bleeding is still difficult to stop, you can use a local tourniquet with pressure bandage. The above is the treatment measures for fingernail cut by knife.