What is an abscess?

• A. A collection of blood in tissue
• B. A collection of pus underneath the skin
• C. An area of swelling due to fluid retention
• D. A type of cancerous growth

Answer: (B)

An abscess is defined as a localized collection of pus that accumulates in the tissues of the body, typically as a result of infection. This pus is made up of dead white blood cells, bacteria, and tissue debris, and it forms as the body's immune response works to contain and eliminate the infection.

The presence of an abscess can be identified through symptoms such as pain, swelling, redness, and warmth in the affected area, often leading to the formation of a noticeable lump underneath the skin. When an abscess is treated, it may require drainage to remove the accumulated pus and aid in healing.

The other options describe different medical conditions that do not align with the specific definition of an abscess; for example, a collection of blood in tissue refers to a hematoma, while fluid retention is related to edema, and a cancerous growth pertains to tumors, which do not produce pus as an abscess does. Thus, the specific nature of pus accumulation distinctly identifies the correct choice.