What term describes a localized swelling filled with blood beneath the skin?

The term that describes a localized swelling filled with blood beneath the skin is hematoma. A hematoma occurs when blood vessels are damaged and blood leaks into the surrounding tissues, causing swelling and discoloration. This condition is typically the result of trauma or injury, and the accumulation of blood can lead to visible bruising in the affected area. As the body heals, the hematoma may gradually change colors and eventually resolve as the absorbed blood is cleared away by the body’s natural healing processes.

The other terms listed do not pertain to localized blood collections. Leathery skin describes a texture or condition of the skin often caused by prolonged sun exposure or aging. Bilirubin is a yellow compound produced from the breakdown of red blood cells and is most commonly associated with jaundice or liver issues, rather than localized swelling. Photosensitivity refers to an increased reaction of the skin upon exposure to sunlight, which is unrelated to the accumulation of blood under the skin.