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Talk to your doctor. Ask your doctor if you have a platelet disorder. Stop taking blood thinners if possible. Check for signs of a blood clotting disorder.
If you are worried that you have an underlying disorder that causes you to bruise easily, talk to your doctor. They can run tests to see if there is any condition that may cause you to bruise due to slight bumps or very minor injuries. Let your doctor know of any other symptoms that you may be symptoms of larger disorders. Platelet disorders, such as those that underlie diseases like leukemia or AIDS, can cause increased bruising. If you have too few platelets, you may suffer from increased bleeding or dark red or purple bruises in addition to more frequent bruises. See your doctor if you are concerned about increased bruising. Blood thinners can cause increased bruising. If you are taking blood thinners, such as warfarin or heparin, ask your doctor to do a PT test to see if you can reduce the dose or eliminate taking blood thinners. If you cannot be taken off blood thinners, be more cautious in situations that may cause you to bruise - the medicine will make you more prone to bruising. If you have recently taken blood thinners but no longer are, you may still be at risk of increased bruising. The effects will wear off after a short time. Blood clotting disorders, such as vitamin K deficiency or hemophilia, can cause an increased rate of bruising when the blood takes longer to clot under your skin. You may have a clotting disorder if minor injuries cause large, deep bruises. You will also have other symptoms, such as nosebleeds, painful or tight joints, blood in your urine or feces, or excessive bleeding.  Hemophilia is an inherited disorder, so have yourself checked if anyone in your family has it. See your doctor if you think you may have a clotting disorder. You may be able to rectify the disorder through diet changes, exercise, and prescription blood thinners.