What is a Bruise and How Does It Form?
A bruise, medically referred to as a contusion, forms when small blood vessels (capillaries) beneath the skin rupture, often due to trauma. Blood leaks into surrounding tissues, causing discoloration—initially red or purple, later turning blue, green, yellow, and finally brown as the body breaks down the blood cells. The stages of color change typically correspond to the bruise’s age. While minor injuries are the most common cause, unexplained bruises may arise from a variety of other medical, nutritional, or systemic factors.
When Is an Unexplained Bruise a Cause for Concern?
Occasional, isolated bruises are rarely a cause for alarm. However, you should consider seeking medical attention if you notice any of the following:
