Etymologically, the word pus comes from the Latin “pus” which means “dirt”. Pus is a dense white, greenish or yellowish liquid that is produced in infected or inflamed tissues and flows from wounds. It is made up of leukocytes, dead cells, serum, as well as other substances; In other words, it is a reaction of the body to an infection, generally of the bacterial type. pus can form in different areas of the body, this can cause certain conditions such as fever, tremors, pain in the affected area, chills and redness in that area.

This fluid is produced by living or dead white cells that move into the intercellular spaces around the affected cells. a clear example where this suppuration occurs is in a pustule or pimple where this liquid forms under the epidermis, but also in an abscess we can find accumulation of pus in a closed tissue, which is usually caused by a bacterial or parasitic infection . Acne that develops due to the accumulation of dead cells and certain sebaceous secretions that cover the hair follicles, can generate pus, when a bacterial agent appears that is responsible for infecting the pores and helping the spread of pimples; It should be noted that many times when a person squeezes a pimple with pus and makes this liquid come out of the inflamed tissue, it can cause skin lesions, scars and even new infections.

In some diseases there is the presence of pus without it being caused by an infection, these are those that present with tissue necrosis or accumulation of dead tissue, such as psoriasis or transient neonatal pustular melanosis.