Nails smashed into the blackened can be conservative treatment, nail extraction treatment. 1. Conservative treatment: If the nail is smashed and blackened, but the nail is still relatively strong, not loose, you can choose conservative treatment. You can apply cold compresses within 48 hours of the injury to reduce bleeding, and hot compresses after 48 hours to promote the absorption of bruises. If the pain is more obvious, you can take oral non-steroidal anti-inflammatory pain medication, such as ibuprofen, indomethacin. 2. Nail extraction treatment: If the nail is relatively loose, you can carry out nail extraction treatment, after pulling out the nail, but also to clean up the nail bed below the bruises and necrotic tissues, in the new nails do not grow out before, pay attention to the protection of the local area, to avoid being hit again. Nails smashed to black, according to the specific severity, under the guidance of the doctor to choose the appropriate treatment, the above drugs should be used in accordance with medical advice, can not blindly use their own.