Itchy bruises are a very common symptom, as follows: 1. Patients may develop skin bruises after trauma, which is due to the rupture of subcutaneous capillaries caused by bumps and bruises, resulting in capillary bleeding, so that subcutaneous bruises may easily appear, and inflammatory exudation due to bumps and bruises may lead to inflammatory irritation, thus causing itchy skin; 2. This may also cause nerve damage, and in the process of nerve repair there may also be symptoms of itchy skin. In this case, you can apply heat to the bruised area, which can promote local blood circulation to relieve bruising; 3, if the bruised skin often occurs, there may be some blood system diseases, such as idiopathic thrombocytopenic purpura, oral anti-platelet and anticoagulant drugs may also cause skin bruising, so this situation requires further examination to clarify diagnosis.