The purple color of the arm after cardiac imaging may be caused by a local hematoma caused by the antiplatelet drugs used, or it may be bleeding from the puncture point. Cardiac imaging can be used to check the surface of the heart blood vessels and the ventricular cavity blood filling, etc. If used to check the coronary artery obstruction, most of the examiners will take aspirin and other antiplatelet aggregation drugs, such drugs due to the inhibition of the normal process of blood coagulation, there is a certain possibility of causing skin hematoma of the upper extremities, manifested as localized bruising, bleeding is serious need to stop the medication and consult the doctor temporarily. In addition, if the puncture point of cardiac imaging is chosen in the upper limb, insufficient pressure hemostasis after the examination may cause bleeding at the puncture point, which is manifested as local hematoma and skin bruising, and prompt pressure hemostasis and other treatments are needed. If the bruising continues to increase or if pain occurs, it is recommended to go to the hospital promptly.