What are pustules?

Pustules are specifically defined as small elevations on the skin that contain pus, which typically appears white or yellow due to the presence of inflammatory cells. They are often associated with various skin conditions, including acne, where the inflammation occurs due to bacteria, oil, and dead skin cells clogging hair follicles. The pus in pustules indicates a build-up of white blood cells fighting an infection or inflammation, serving as a visual marker of these processes. This characteristic distinguishes pustules from other skin abnormalities, such as bumps or blisters, which do not necessarily contain pus or may have different appearances and causes.