The painful symptoms usually disappear in about 3 days and the bruising takes about 1 month to subside. A bruise on a pinched fingernail is usually caused by the rupture of cells or capillaries under the skin due to external pressure, and the blood clots outside the blood vessels, turning the inactive red blood cells black. Patients usually experience mild pain, which resolves in about 3 days. Patients can spray the pinched surface with Yunnan Baiyao spray to promote local blood circulation and help reduce the bruising and swelling; and pay attention to reducing finger activity, which usually leads to a full recovery in about 1 month. In addition, if the fingernail is pinched and the skin of the wound is broken, the patient should pay attention to disinfection and avoid touching water until the wound heals to avoid wound infection.