What do leukemia bruises look like? do they grow?

See below.: The bruising that patients with leukemia have are caused by low platelets. Usually they don't look different that "regular" bruises, but a person usually notices that they have many more bruises than normal and in unusual areas of the body (chest, back, for example). Sometimes the bruises can have a hard lump associated with them (purpura). If you have new unexplained bruising, see your doc.