If the nail is lost, the nail can grow out if there is no damage to the nail matrix and nail bed. If the nail is lost due to trauma, the nail can grow back if the nail matrix and nail bed are not damaged, but it will take a long time. During this period, you should take care to protect the nail from water infection, avoid contact with corrosive and irritating objects to prevent the nail from growing out unhealthy, and prevent sharp objects from damaging the nail bed. If there is serious damage to the nail bed or nail matrix, the nail will not usually grow back. If a fungal or bacterial infection causes the nail to fall out, the nail can usually grow back after treatment with antibacterial medication. Patients with nail loss need to visit a dermatologist and follow the doctor’s instructions for treatment.