Foot nail cap off may be caused by trauma, should be routinely disinfected on the broken skin mucosa, to prevent infection. The first thing you should do is to use flowing water or saline to flush the local bruises or secretions, and then use polyvinyl iodide ketone solution to wipe the broken skin mucosa, as well as the nail bed and the surrounding skin, after which you can use petroleum jelly gauze to cover the surface of the nail bed, and then use aseptic gauze for bandaging. After the trauma should pay attention to rest, elevate the affected limbs, avoid local extrusion, avoid excessive force, so as not to cause stimulation to the wound, induced bleeding, and follow the doctor’s instructions to change the medicine on time. Dietary aspects of eating some rich in vitamins, crude fiber rich fruits and vegetables. When the toenail cap falls off, you should go to a regular medical institution for treatment in time to prevent infection.