The whole process of nail bruising and shedding is that the nails become localized congestion, edema, necrosis, and then the new nails grow into the old ones and fall off completely. Most of the nails fall off after bruising due to trauma and extrusion. Initially, the general performance of the end of the finger swelling and severe pain, nail local congestion and edema, when the disease is further developed, the end of the finger part can appear cyanosis, pallor, bruising under the nails, local tissue ischemia, necrosis. In addition, patients with abnormal coagulation function are also prone to under-nail bruising, except for the absence of pain, the situation is basically the same as trauma. When the newborn nail grows up, the original nail will fall off completely. During the shedding period, we need to pay attention to the affected finger with or without redness, swelling, heat and pain, to avoid local infection, specifically under the guidance of the doctor to carry on the treatment. During the treatment period, it is recommended to avoid patients to perform gravity labor to avoid re-injury. For those with abnormal coagulation function, they should go to the hospital in time, and follow the doctor’s instructions to be treated accordingly after a clear diagnosis.