What is the name for a localized mass of blood?

A localized mass of blood is referred to as a hematoma. This occurs when blood collects outside of blood vessels, typically due to an injury or trauma that leads to the rupture of blood vessels. When this happens, blood seeps into the surrounding tissues, creating a swelling or pocket of blood that can be felt as a lump under the skin.

Hematomas can vary in size and can develop in different areas of the body, depending on where the injury occurred. They are often associated with bruising and can sometimes cause pain or discomfort in the affected area. Understanding the nature of a hematoma is important in medical contexts, as its presence can indicate underlying issues, potential complications, or the need for medical intervention.

Other terms in the list, such as hemoconcentration, hemorrhage, and hemolysis, refer to different processes. Hemoconcentration describes an increase in the concentration of blood components due to reduced plasma volume. Hemorrhage refers to the loss of blood from the circulation. Hemolysis is the breakdown of red blood cells, leading to the release of hemoglobin. While these processes involve blood, they do not describe a localized mass of blood like a hematoma does.