Abscesses are primarily caused by bacterial infections, where bacteria enter the body through a wound or hair follicle and lead to the accumulation of pus. This can be due to minor breaks in the skin, an obstructed oil or sweat gland, or an inflamed hair follicle. Once the bacteria penetrate the skin, the body's immune system tries to fight the infection, sending white blood cells to the area. This battle between the bacteria and the white blood cells results in a collection of dead tissue, causing a painful pocket of pus. Factors such as a weakened immune system, certain chronic conditions like diabetes, poor hygiene, and exposure to unsanitary conditions can increase the likelihood of developing an abscess.