Which of the following describes a Pustule?

A pustule is specifically characterized as an inflamed lesion that is filled with pus. This type of skin eruption typically appears red and swollen, indicating inflammation, and the presence of pus gives it a distinct appearance that is crucial for identification. Pustules are often associated with conditions like acne or infections, where immune responses lead to the accumulation of white blood cells in the affected area, resulting in pus formation.

In contrast, other options describe different types of skin conditions: a red, raised skin spot refers to various types of skin irritations or lesions but does not necessarily imply the presence of pus; an area of skin discoloration points to pigmentation changes rather than an inflammatory process; and a small, round lesion could describe various skin issues but lacks the specific inflammatory and purulent characteristics that define a pustule. Understanding these distinctions is essential for identifying skin conditions accurately in practice.