Pus

This is an accepted version of this page Pus is an exudate, typically white-yellow, yellow, or yellow-brown, formed at the site of inflammation during infections, regardless of cause.

Pus consists of a thin, protein-rich fluid (historically known as liquor puris[3][4]) and dead leukocytes (white blood cells) from the body's immune response (mostly neutrophils).

Some disease processes caused by pyogenic infections are impetigo,[9] osteomyelitis, septic arthritis and necrotizing fasciitis.

[12]: 80 "If a patient was lucky ... a thick cream-colored odorless fluid would appear within five or six days"; such "laudable" pus was considered "a sure sign that the wound would heal" [11]: 344 because it meant "Nature has put up a bold fight against the invader".

[13] "On the other hand, if the pus gradually became watery, blood tinged and foul smelling, it was designated 'sanious' [14] [or 'ill-conditioned' ] [15] and the wound condition was considered unfavorable".

Pus with blood coming out of ring finger
An abscess is an enclosed collection of pus.
Duodenoscopy image of hepatopancreatic ampulla with pus exuding from it, indicative of cholangitis