Which of the following correctly describes the term "pustule"?

The term "pustule" is accurately described as a raised lesion filled with pus, which primarily consists of dead white blood cells, bacteria, and tissue debris resulting from inflammation. This type of lesion typically occurs during skin conditions such as acne or infections where the body responds to irritants or pathogens. The presence of pus indicates an immune response to infection or irritation, making this descriptor the most precise for understanding what a pustule is within the context of skin physiology.

The other descriptions, while related to skin conditions, do not specifically capture the essence of a pustule. For example, dead skin and bacteria can be present in various skin issues, but this does not encapsulate the definition of a pustule. Similarly, an open comedo refers to a clogged hair follicle, typically filled with skin cells and oil, rather than pus. While inflamed and red pustules often occur, not all pustules display these characteristics, especially in the initial stages of formation. Thus, this term is best defined by its association with pus and the immune response involved.