Black-and-blue mark is a phrase commonly used to describe a bruise, which is a common injury that occurs when blood vessels in the skin and tissue are damaged. The discoloration that appears on the skin is often purplish-black in color, hence the name black-and-blue mark. However, there are other terms that can be used interchangeably with black-and-blue mark, such as contusion, hematoma, ecchymosis, and swelling. Each term describes a similar type of injury, but they may vary in severity and appearance. Whether you have a black-and-blue mark or a contusion, it's important to treat it immediately and seek medical attention if necessary.