Which term describes a superficial, elevated lesion containing pus?

• A. Nodule
• B. Vesicle
• C. Plaque
• D. Pustule

Answer: (D)

A pustule is a superficial, elevated lesion filled with pus. Pus is purulent material produced by neutrophils and debris as part of an inflammatory or infectious process. Pustules are typically small, often less than 1 cm, and seen in conditions like acne, folliculitis, or impetigo.

This differs from a vesicle, which is a fluid-filled blister containing clear serous fluid; a bulla is a larger version of that fluid-filled blister. A nodule is a solid, raised lesion that extends deeper into the dermis or subcutaneous tissue, not filled with pus. A plaque is an elevated, flat-topped lesion with a broad surface, often due to thickened skin or accumulation of cells, not specifically filled with purulent material.

So the term that matches a superficial, elevated lesion containing pus is pustule.