What do you call a raised, inflamed papule with a white or yellow center containing pus?

A raised, inflamed papule with a white or yellow center that contains pus is referred to as a pustule. This type of lesion is a common manifestation of various skin conditions, including acne and other inflammatory or infectious processes.

Pustules are distinguished by their characteristic formation, which includes a base that is red and swollen, while the center is filled with pus, making it appear white or yellow. This pus is generally composed of dead white blood cells, bacteria, and skin debris. The presence of pus indicates an ongoing inflammatory response, often as a result of an infection or irritant.

In contrast, a papule is typically a solid, raised bump that is not filled with pus and lacks the characteristic center of a pustule. A cyst refers to a closed sac-like structure containing fluid or semi-solid material, and a macule is a flat, discolored area of skin without elevation. These distinctions are important in differentiating between various skin lesions and understanding their implications in skincare and treatment.