An abscess is a painful collection of pus that forms in the body due to an infection. It can occur in various parts of the body, such as the skin, teeth, or internal organs. The body’s immune system responds to the infection by sending white blood cells to the area, which leads to the buildup of pus, a thick fluid containing dead cells, bacteria, and tissue debris. Common causes of abscesses include bacterial infections, blocked glands, or injuries. Treatment often involves draining the pus and may require antibiotics to eliminate the underlying infection. If left untreated, an abscess can lead to more serious health issues.