What are pustules primarily characterized by?

Pustules are primarily characterized by white or yellow inflammation containing pus. They are a type of skin lesion that appears raised above the surrounding skin and is filled with a mixture of pus, which consists of dead white blood cells, bacteria, and inflammatory fluid. The presence of this pus is what distinctly defines pustules and differentiates them from other types of lesions like papules or vesicles.

Pustules typically occur in various skin conditions, including acne, and are often accompanied by redness and inflammation in the surrounding area. Understanding this characteristic is crucial for identifying, treating, and managing such skin issues effectively.