Abscesses are firm or compressible, often painful swellings that contain pus. They can develop in many areas of the body including around tooth roots, anal glands, under the skin, or in the liver. Abscesses are caused by the introduction of bacteria through wounds, injuries, or bloodborne in the case of an internal organ abscess. Any area of the body that becomes infected can eventually cause an abscess to form such as anal gland abscess, bite wound abscess, prostatic abscess, or brain abscess from inner ear or sinus infection. Treatment depends on severity and location and usually involves removal of the pus either through drainage or surgical removal, the use of antibiotics based on the type of bacteria and location of the abscess, and pain control medications. Monitoring after initiating treatment includes watching the site for additional drainage if the abscess was superficial or monitoring the pet for improvement of clinical signs. Delayed treatment of abscesses can lead to chronic draining tracts or worse.