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Unlike acanthosis nigricans, bruises are caused by leakage of blood after an injury. The list of usual suspects includes bumping into bedposts or other objects and not remembering, rigorous exercising (which can cause tiny tears in blood vessels, particularly in athletes and weightlifters), and old age.
Heal New Bruises Quickly. 1  1. Apply a cold compress, such as a cold washcloth, to the bruise for 1 to 2 days after the injury. Never apply ice directly to your skin; it could cause frostbite. 2  2. Avoid massaging the bruise or applying heat, which may cause it to worsen. 3  3. Elevate and rest the bruised area.  4. Take bromelain.