What is the definition of a contusion in medical terms?

A contusion, in medical terminology, is defined as a bruise. It occurs when small blood vessels are damaged due to a direct impact or trauma, causing localized bleeding under the skin without breaking the surface. This results in discoloration and swelling in the affected area. The mechanism of injury distinguishes a contusion from other types of injuries such as scrapes, cuts, or open wounds, which involve the disruption of skin integrity. Understanding this definition is crucial for recognizing and properly assessing the severity of soft tissue injuries in a clinical setting, as well as for determining the appropriate first aid or treatment needed.