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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.
Bruises typically appear immediately or within 72 hours following injection. Typically, the later a bruise appears the less severe it will be unless you're taking blood thinners after your treatment. I hope this information is helpful for you. Stephen Weber MD, FACS.