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".