The main causes of easy bruising of the skin include blood disorders, medication factors, vascular factors and so on. As each person’s personal situation is different, it is recommended that people who have this condition for a long time should go to the hospital for further examination, and after clarifying the cause of the disease, the treatment should be directed to the cause of the disease. 1. Blood diseases: Blood clotting disorders caused by thrombocytopenia (such as thrombocytopenic purpura, etc.) can cause skin bruising and other symptoms due to abnormal blood clotting. 2. Drugs: When people take anticoagulant and antiplatelet drugs for a long time (such as aspirin, warfarin, etc.), it will cause prolonged blood clotting time and purple skin. It is recommended to check the blood clotting function regularly under the guidance of the doctor. 3. Vascular factors: some people’s blood vessels are brittle and less elastic. After being stimulated by trauma, skin bruising is easy to appear.