Pus is a whitish-yellow or yellow substance produced during inflammatory responses of the body that can be found in regions of bacterial infection. An accumulation of pus in an enclosed tissue space is known as an abscess. A visible collection of pus within or beneath the epidermis, on the other hand, is known as a pustule, such as pimples. Phyla/Divisions Actinobacteria Aquificae Bacteroidetes/Chlorobi Chlamydiae/Verrucomicrobia Chloroflexi Chrysiogenetes Cyanobacteria Deferribacteres Deinococcus-Thermus Dictyoglomi Fibrobacteres/Acidobacteria Firmicutes Fusobacteria Gemmatimonadetes Nitrospirae Omnibacteria Planctomycetes Proteobacteria Spirochaetes Thermodesulfobacteria Thermomicrobia Thermotogae Bacteria (singular, bacterium) are a major group of living organisms. ... An abscess is a collection of pus collected in a cavity formed by the tissue on the basis of an infectious process (usually caused by bacteria or parasites) or other foreign materials (e. ... Acne of a 14 year old boy during puberty. ...

Pus consists of a thin, protein-rich fluid known as liquor puris and dead neutrophils, which are part of the body's innate immune response. Neutrophils are stored in bone marrow and are released when the need to fight infection arises, usually triggered by cytokine release from macrophages that sense invading organisms. They then travel to the infected tissue, engulfing and killing bacteria. After it has killed a bacterium, the neutrophil dies. These dead cells are then phagocytosed by macrophages, which break them down further. Pus, therefore, is the creamy material composed of these dead neutrophils. Neutrophil granulocytes (commonly referred to as neutrophils) are a class of white blood cells and are part of the immune system. ... Macrophages (Greek: big eaters) are cells found in tissues that are responsible for phagocytosis of pathogens, dead cells and cellular debris. ... Phagocytosis (literally, cell eating) is a form of endocytosis where large particles are enveloped by the cell membrane of a (usually larger) cell and internalized to form a phagosome, or food vacuole. ...

Neutrophils are the most abundant type of leukocyte in human blood, for anywhere from 40% to 75% of leukocytes. White Blood Cells is also the name of a White Stripes album. ...

When seen in a wound, pus indicates it is infected, and should be cleaned with an antiseptic. An antiseptic (Greek αντι, against, and σηπτικος, putrefactive) is a substance that prevents the growth and reproduction of various microorganisms (such as bacteria, fungi, protozoa, and viruses) on the external surfaces of the body. ...

Something that creates pus is called suppurative, pyogenic, or purulent. If it creates mucus as well as pus, it is called "Mucopurulent". Mucus is a slippery secretion of the lining of various membranes in the body (mucous membranes). ...

Despite normally being of a whitish-yellow hue, changes in the color of pus can be observed under certain circumstances. Blue pus is found in certain infections of Pseudomonas aeruginosa as a result of the pyocyanin bacterial pigment it produces; amebic abscesses of the liver, meanwhile, produce brownish pus.