If you are still bruised and purple after 10 days of injection, it may be caused by coagulation dysfunction, platelet abnormality and blood exudation, which can be further examined to confirm the diagnosis. 1. Coagulation dysfunction: prolonged bruising and purpling may be caused by coagulation dysfunction, resulting in prolonged clotting time. Coagulation function test can be performed to help diagnosis. 2. Platelet abnormality: Reduced platelets, resulting in prolonged clotting time, can also cause long-term bruising and purple symptoms, can check the blood routine and other diagnostic assistance. 3. blood oozing: injection, if there is no timely pressure on the injection site, can cause hematoma, capillary damage, resulting in skin bruising, generally do not need treatment, hot towels can be used hot compresses, generally 3 to 5 days, bruising can be absorbed. After 10 days of injection or bruising purple, can first rule out coagulation disorders, platelet abnormalities caused by, and then hot compresses and other treatments, so as not to delay the condition.