Which term best describes a small, circumscribed lesion containing pus, often associated with bacterial infections?

• A. Vesicle
• B. Papule
• C. Macule
• D. Pustule

Answer: (D)

Verified step by step guidance

1. Step 1: Understand the definitions of each term related to skin lesions. A vesicle is a small fluid-filled blister, a papule is a small raised solid bump, a macule is a flat, discolored spot, and a pustule is a small, circumscribed lesion containing pus.
2. Step 2: Recognize that pus is a thick fluid composed of dead white blood cells, bacteria, and tissue debris, typically indicating an infection, especially bacterial.
3. Step 3: Identify that the question asks for a lesion containing pus, which immediately narrows the options to pustule, as it is specifically defined by the presence of pus.
4. Step 4: Compare the other options to the characteristic of containing pus: vesicles contain clear fluid, papules are solid without fluid, and macules are flat and do not contain fluid or pus.
5. Step 5: Conclude that the term 'pustule' best fits the description of a small, circumscribed lesion containing pus, often associated with bacterial infections.