An abscess is a collection of pus-like lumps- that can build up anywhere around the body. There are different types of abscesses including Skin abscesses and Internal abscesses. Infections may cause these abscesses and a possible treatment option is a surgical treatment. Pus consists of white blood cells, bacteria, liquid and tissue that is dead. White blood cells can be living or dead. An abscess can form anywhere on the body. The parts of the body where they are most likely to develop are the skin, around the mouth or on an organ.