Understanding Random Bruising: 10 Possible Medical Reasons

5. Hemophilia

Hemophilia is a genetic disorder that prevents the blood from clotting. The reduction or absence of one of the clotting factors may result in visible or invisible bruising. Something as benign as bumping against a wall could lead to bruising and prolonged internal bleeding. Treating the disorder depends on which clotting factor is missing. Those with hemophilia A, the most common form of the disease, need infusions of antihemophilic globulin, while those with hemophilia B need plasma thromboplastin component drips or injections.