what is causing my bruising
By Dr. Mercola. Any type of traumatic injury, such as a fall, can cause capillaries (small blood vessels) near your skin's surface to break and leak red blood cells. This causes the reddish-purple or black and blue appearance of bruises on your skin.y Dr. Mercola. Any type of traumatic injury, such as a fall, can cause capillaries (small blood vessels) near your skin's surface to break and leak red blood cells. This causes the reddish-purple or black and blue appearance of bruises on your skin.