What term refers to localized collections of pus that may be under the skin or deep within the body and cause tissue destruction?

• A. Ulcers
• B. Cysts
• C. Edemas
• D. Abscesses

Answer: (D)

Abscesses are localized collections of pus that form as a result of infection. When the body's immune system fights bacteria, neutrophils and other debris accumulate, creating purulent material. This pus can collect just beneath the skin or deeper inside the body, and the surrounding tissue is often damaged by inflammatory enzymes and bacterial toxins, leading to tissue destruction. Clinically, an abscess tends to be a tender, swollen area that may be red and warm, and it can feel like a fluctuant lump if you press on it. Deep abscesses may require imaging to locate and are usually treated with drainage (incision and drainage) and antibiotics to clear the infection.

Ulcers are open sores where tissue has broken down and exposed underlying structures, not necessarily involving a pus-filled cavity. Cysts are closed sacs that may contain fluid or other material but are not typically purulent collections. Edema is swelling caused by fluid accumulation, not pus.