An abscess is a collection of pus within the body, in the tissues, organs or internal cavities, caused by the body’s response to an infection. An skin abscess is a furuncle and carbuncle, also known as blisters, boils or blains, and these pus swellings usually occur on the skin (cutaneous) or just underneath the skin (subcutaneous) where it may protrude through the skin. A deep seated abscess is a ‘ball of pus’ that grows internally and is usually not visible from the outside.