What is the term for a mass of blood outside of blood vessels, often resulting from an injury?

A hematoma is a localized collection of blood outside of blood vessels, typically caused by an injury or trauma that ruptures blood vessels and allows blood to accumulate in surrounding tissues. This accumulation can lead to swelling or discoloration, commonly seen as bruises.

In contrast, Hodgkin's Disease is a type of lymphoma, which is a cancer that originates in the lymphatic system, and is unrelated to blood accumulation outside vessels. An idiopathic disease refers to a condition with an unknown cause, which does not describe the physical nature of a hematoma. Fungemia involves the presence of fungi in the bloodstream, which is distinctly different from the concept of a blood mass from an injury. Understanding these distinctions clarifies why a hematoma is the correct term for a mass of blood that results from an injury.