Blood vessels suddenly bulging bruises are common in the local blood vessels by external damaging factors, but also the symptoms of many diseases, such as venous thrombosis, hemangioma and so on. 1. Injurious factors: common in the impact, intravenous needle stimulation, etc., causing damage to the blood vessel wall, bruises appear in the mass, local hot compresses can be relieved. 2. Venous thrombosis: due to venous valve insufficiency, varicose veins, etc., resulting in local vascular blockage, tissue hypoxia, sudden bulging, pain and so on. Anti-coagulant and thrombolytic drugs such as aspirin and warfarin can be used under doctor’s guidance. If the symptoms are serious, it is necessary to carry out sclerosing agent injection or surgical stripping of thrombus and other treatments. 3. Hemangiomatous changes: Due to the rapid growth of some superficial hemangiomas, they compress the surrounding tissues, resulting in the formation of a mass. It can be relieved by using medicines such as propranolol ointment under doctor’s guidance, and surgical excision is needed in serious cases. Prolonged standing and sitting will aggravate the congestion of the lower limbs and induce the disease, and it is recommended to avoid it. If discomfort occurs, go to the hospital promptly.