How are pustules generally characterized?

Pustules are characterized as small inflamed elevations that contain pus. This type of lesion typically forms as a result of an infection or inflammation, where the accumulation of pus takes place within a cavity or sac under the skin surface. The presence of pus, which is a thick fluid composed of white blood cells, dead skin, and bacteria, is what distinguishes pustules from other skin lesions.

In contrast, the other choices describe different types of skin lesions. A small, dry bump refers to a different skin condition that lacks the inflammatory response and pus that define pustules. A small elevation that may not be inflamed indicates a more benign growth that does not involve the infection typically seen in pustules. Lastly, a flat spot on the skin describes a macule, which does not involve elevation or inflammation at all. Recognizing these differences is crucial for effective skin assessment and treatment.