What Causes Pus?
Pus is a viscous substance that is a part of the body’s natural immune response system. It is most often whitish-yellow in color, although it may also be greenish, brownish, reddish, or even blue. Pus often has a somewhat necrotic smell, and is often the sign of an infection when found in a wound. When the body detects some sort of foreign infection, it immediately begins a response to neutralize the invader and limit damage to the system. White blood cells, or leukocytes, are the cells responsible for immune response in the body, and are produced in the marrow of bones. The majority of these white blood cells are a type known as neutrophil, which are tasked with attacking foreign bacteria and fungi. When a foreign invader is detected, leukocytes known as macrophages detect the invasion and release cytokines that act as an alarm system. This alerts neutrophils of the invader, and they begin to make their way towards the site of the infection. They begin their journey through blood vess
