How are purulent inflammation abscesses?

Production of pus exudate of microbes and neutrophils (necrotic) and edema fluid. Most frequently after bacterial infection (staph) which are pyogenic agents E.g; Acute appendicitis. An abscess is a localized area of purulent inflammation, they have a central region of necrotic leukocytes, and a zone of preserved neutrophils , and outside is a vascular dilation area When persistent place of abscess (brain) we remove it surgically and cannot get rid of it auto