If the nail turns purple-black after being smashed, normal walking can be resumed in about 2 weeks after standard treatment. If the nail turns purple-black after being smashed, it indicates the presence of subxiphoid bruising. The treatment depends on the extent of the injury. If the injury is mild, the nail has not yet separated from the nail bed, the patient’s pain is mild and swelling is not obvious. Cold compresses can be applied within 48 hours after the injury to avoid further aggravation of the swelling, while hot compresses can be applied after 48 hours to promote the swelling to subside and oral medication to promote the recovery of the injury. If the injury is severe, the nail has been separated from the nail bed, or even combined with nail bed laceration, the nail should be extracted and the laceration nail bed should be sutured, and the patient should be treated with regular postoperative medication changes and oral antibacterial and blood-stasis-boosting medications. Usually the trauma can walk normally in about 2 weeks and can be replaced with a new nail in about 3 months. In addition, patients should pay attention to protecting the affected toe after the injury, wear comfortable shoes, and avoid standing for long periods of time.