pus

Pus is an exudate, typically white-yellow, yellow, or yellow-brown, formed at the site of inflammation during infections, regardless of cause. An accumulation of pus in an enclosed tissue space is known as an abscess, a visible collection of pus within or beneath the epidermis is known as a pustule, pimple or spot, and a similar collection of pus around a hair follicle, is known as a boil.

==Terminology== Suppuration is the formation or discharge of pus or may refer to pus itself. The adjectives purulent and suppurative describe the characteristic of containing, relating to, consisting of, or being pus or being related to suppuration. For example, purulent discharge is synonymous with pus while mucopurulent discharge refers to exudate containing both mucus and pus. Seropurulent fluid or discharge contains both serum and pus. A wound or lesion may be described as suppurative or purulent if contains or expresses pus. Pyogenic means producing, generating, or characterized by the expression of pus. The term is often used to describe pyogenic bacteria, organisms whose infections frequently result in pus formation. A pyogenic infection is an infection that is characterized by severe local inflammation, usually with pus formation, generally caused by one of the pyogenic bacteria. The adjective pussy (pronounced ; comparative: pussier, superlative: pussiest) can also refer to pus. This usage is uncommon relative to the common meanings of the homograph pussy.