What is the common name for the buildup of pus in the body?

The buildup of pus in the body is commonly referred to as an abscess. An abscess occurs when the body's immune system responds to an infection, leading to the accumulation of white blood cells, bacteria, and dead tissue, all of which form pus within a localized pocket. This condition can develop in various tissues throughout the body and often presents as a painful, swollen area that can feel warm to the touch.

In contrast, a phlegmon is a diffuse inflammatory process without a distinct boundary, often affecting connective tissues. A boil, also known as a furuncle, is a specific type of abscess that occurs around a hair follicle and is typically caused by bacterial infection. Meanwhile, a cyst is a closed sac filled with fluid or semi-solid material, which is not associated with infection or pus buildup in the same manner as an abscess. Understanding these distinctions helps clarify why the term "abscess" is the most accurate representation of pus accumulation in the body.