Factors affecting the size of a contusion: Natural diseases such as vascular fragility (Easy bruising syndrome), leukemia, scurvy, hemophilia, hypertension, arteriosclerosis and coagulability Conditions prolonging the clotting profile (liver diseases, bleeding disorders) Amount of extravasated blood   Laxity of tissues , e.g. less amount of force cause large area of contusion in scrotum , periorbital region