A large collection of blood under the skin is known as?

A large collection of blood under the skin is referred to as a hematoma. This condition occurs when blood vessels are damaged, allowing blood to leak into the surrounding tissues, leading to swelling and discoloration under the skin. Hematomas can vary in size and severity, and they often result from trauma or injury to the area.

While a contusion and a bruise both involve some level of discoloration and can also occur due to bleeding under the skin, they typically refer to the broader category of soft tissue injuries rather than specifically encompassing a large pooled collection of blood. An abrasion, on the other hand, describes a scrape or wear on the skin's surface, without the pooling of blood. In summary, the term hematoma is most accurate when describing a significant accumulation of blood beneath the skin.