Pus in the finger with pain and swelling usually happens because bacteria enter the skin through a small cut, nail biting, hangnail, injury, or repeated friction. The infection may collect around the nail or deeper inside the finger, causing redness, warmth, throbbing pain, and difficulty touching or bending the area. In some people, the swelling becomes tight because pus gets trapped under the skin. Treatment depends on how deep the infection is and whether pus is still collecting. Warm water soaks may help improve drainage and reduce discomfort in milder cases. Doctors may use antibiotics, antiseptic cleaning, pain-relieving medicines, or drainage if the pus pocket becomes larger or very painful. Keeping the finger clean, dry, and protected from further injury usually helps healing. Do not repeatedly squeeze the pus or puncture the skin at home, as this can spread the infection deeper into the finger. Fever, spreading redness, severe swelling, numbness, or inability to move the finger properly should be checked quickly because deeper hand infections may worsen rapidly.