Knock bruise is generally caused by external force that expands or ruptures the capillaries under the skin, which can be eliminated by general treatment, physical therapy, medication and other methods. 1. General treatment: After the bruise occurs due to bumping, you need to pay attention to rest and brake the affected area to protect the injured part from secondary injury. At the same time, drinking more water can promote the body’s metabolism and accelerate the dissipation of bruises. 2. Physical therapy: patients can use cold towels or ice packs on the bruised parts of the ice, to promote capillary contraction, reduce vascular permeability, reduce the amount of subcutaneous vascular hemorrhage. 48 hours later and then use hot water bags or hot towels on the local hot compresses to promote local blood circulation, to achieve the purpose of the dissipation of bruises. 3. Medication: If the bruise is more serious after the fall, and accompanied by obvious pain, swelling, there may be inflammation, you need to use safflower oil under the guidance of the doctor, Yunnan Baiyao aerosol and other drugs to promote the absorption of bruises. Localized bruising caused by bumping, if the degree of light can be observed, if the bruise further aggravated over time or other symptoms, it is recommended to consult a doctor as soon as possible to avoid delaying the condition.