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Pus is an exudate, typically white-yellow, yellow, or yellow-brown, formed at the site of inflammation during infections, regardless of cause. [ 1 ] [ 2 ] An accumulation of pus in an enclosed tissue space is known as an abscess , whereas a visible collection of pus within or beneath the epidermis is known as a pustule , pimple or spot.
Purulent sputum [5] contains pus, composed of white blood cells, cellular debris, dead tissue, serous fluid, and viscous liquid . Purulent sputum is typically yellow or green. It is seen in cases of pneumonia, bronchiectasis, lung abscess, or an advanced stage of bronchitis. [6]
Purulent or suppurative exudate consists of plasma with both active and dead neutrophils, fibrinogen, and necrotic parenchymal cells. This kind of exudate is consistent with more severe infections, and is commonly referred to as pus. Fibrinous exudate is composed mainly of fibrinogen and fibrin.
An abscess is a localized collection of pus (purulent inflammatory tissue) caused by suppuration buried in a tissue, an organ, or a confined space, lined by the pyogenic membrane. [26] Ultrasound imaging can help in a diagnosis. [27]
Pus usually indicates infection. Frequently medical sources do not differentiate between the two types of discharge, instead using the general term mucopurulent discharge, which, strictly speaking, should only be used to refer to a discharge that contains both mucus and pus. Purulent discharges may be blood-streaked. [citation needed]
Gas in the tissues and putrid-like pus with a gray thin quality are often found in these infections, and they are frequently associated with a bacteremia and high mortality rate. [ citation needed ] Treatment of deep-seated soft-tissue infections includes: vigorous surgical management that includes surgical debridement and drainage.
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Cough can be productive of foul-smelling, purulent mucus (≈70%) or less frequently with blood in one-third of cases. [3] Affected individuals may also complain of chest pain, shortness of breath, lethargy, and other features of chronic illness. [citation needed] Those with a lung abscess are generally cachectic at presentation.