what causes round dark bruises to suddenly appear on skin
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.
A deficiency in vitamin C, also known as scurvy, can cause easy. bruising because vitamin C is essential for healthy collagen. While scurvy is very rare, you may have a slight vitamin C. deficiency that causes purple marks to easily show up on your. arms.