5) Excess of blood loss

We are aware of the fact that bruise is bleeding under the skin but in leukemia patients, blood loss can occur from other body parts such as frequent nose bleeding, heavy menstruations, and bleeding from gums. These kinds of bleeding are unusual in the case of leukemia as they occurred without any injury.
Reasons for bruising

As we already discussed earlier, leukemia is a type of cancer affecting the body’s bone marrow and healthy blood cells. People suffering from leukemia experience abnormal leukocytes along with a low level of platelet cell.
Normally the bone marrow is responsible for the production of different types of blood cells, present inside the bones. When a person is suffering from cancerous leukemia disease, there is an unusual production of white blood cells in the bone marrow. These abnormal cells block and slow down the production of normal blood cells.
Platelets

These are the colorless, disc-shaped cells in the blood which are responsible for the formation of blood clots during an injury. In the case of leukemia, the chances of bruising increased as the patient have a low number of platelets. The reason behind this shortage of platelets is the blockage of its production due to abnormal or unusual amounts of leukocytes production. Scientifically the condition is called thrombocytopenia when there is less number of platelets than normal level in the blood. The normal range of platelets within the healthy human being is 150,000 – 450,000 platelets per ml of blood. The level less than this indicate that there is some sort of problem inside the body.