Final answer:
A pustule is a raised, inflamed papule with a white or yellow center containing pus. It is commonly associated with acne.
Step-by-step explanation:
A pustule is a raised, inflamed papule with a white or yellow center containing pus. It is a type of skin lesion commonly associated with acne. Acne occurs when hair follicles become clogged by shed skin cells and sebum. The infection by acne-causing bacteria can lead to the formation of pustules.