After a long time in prison, this patient, developed carbuncle. This is a skin infection that often involves a group of hair follicles. The infected material forms a lump, which occurs deep in the skin and may contain pus.When a person has many carbuncles, the condition is called carbunculosis. Most carbuncles are caused by the bacteria Staphylococcus aureus. The infection is contagious. This means it can spread to other areas of the body or other people. Good general health and hygiene may help prevent some staph skin infections. These infections are contagious, so care must be taken to avoid spreading the bacteria to other people.