The 5-year-old child’s ankle bruises may be caused by trauma, abnormal blood clotting function and other reasons. 1. Trauma: when a 5-year-old child’s ankle is hit or accidentally bumped, it will easily lead to subcutaneous capillary rupture, so that the local blood seepage, appearing 5-year-old children’s ankle bruises. 2. Abnormal coagulation function: If a 5-year-old child suffers from coagulation factor deficiency or thrombocytopenia, it will easily lead to abnormal coagulation function and the phenomenon of ankle bruising. If the symptoms of ankle bruising in a 5-year-old child can’t be relieved and are accompanied by other symptoms, parents should take the child to the hospital immediately to clarify the cause of the disease and follow the doctor’s instructions for treatment.