Trauma Survivors Network - provided by ATS

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Abscess

An abscess is a collection of pus in any part of the body as the result of an infection. The symptoms of abscess are redness, heat, swelling, and pain around the area. The abscess is usually caused by the immune system’s attempt to isolate an infection by sending lots of white blood cells to the area. Abscesses are usually treated by draining the pus and thoroughly cleaning the wound. The outcome of an abscess depends on the location and severity of the infection. However, it is usually fairly easy to have a full recovery. 

References:
http://en.wikipedia.org/wiki/Abcess
http://www.nlm.nih.gov/medlineplus/ency/article/001353.htm