Felons are closed-space infections of the fingertip pulp.
Fingertip pulp is divided into numerous small compartments by vertical septa that stabilize the pad. Infection occurring within these compartments can lead to abscess formation, edema, and rapid development of increased pressure in a closed space. This increased pressure may compromise blood flow and lead to necrosis of the skin and pulp. Thumb and index finger are the most commonly affected digits. With skin necrosis, spontaneous decompression may occur.