If the patient’s foot is smashed and the toenail becomes black, the following treatment measures can be taken: a. The patient should go to the orthopedic department of a level II or higher hospital for consultation to clarify whether there is a fracture in this area. Because this part of the smash injury violence is very large, it is very likely to cause fractures related to the toe. Some patients often do not care, thinking that there is only superficial blackening of the toenail and swelling of the soft tissues, but in fact the probability of fracture in this area is very high. Once the fracture is clearly present, a simple repositioning technique is required, followed by external fixation with a cast or splint. The blackened toenail can be treated in two ways: 1. The blackened toenail is relatively small, or although the toenail is blackened to a greater extent, but the toenail is relatively firm and not loose, you can take conservative treatment, that is, use ice on the area to apply cold compresses, and then let the patient take oral Nimesulide to reduce inflammation and pain. However, during the treatment period, the patient’s foot, especially around the nail groove, should not be exposed to water to prevent infection. If the new toenail grows to replace it, the blackened area will fade on its own, or the toenail may fall off on its own. 2. If the toenail becomes black and the toenail is obviously loose or unstable, nail removal treatment is required. The nail pulling treatment is mainly to remove the loose nail, and if there is obvious bruising or necrotic tissue under the nail bed, a corresponding debridement will be performed. Patients should not worry that the toenail will not grow out. Generally, as long as there is no obvious and serious damage to the nail root, the toenail will grow out.