To determine whether it is purulent dactylitis, we can consider the performance of the fingers and the whole body: first, the patient has redness, swelling, pain, and high local skin temperature between the fingers and even leads to a generalized fever. Second, the painful sensation of the finger becomes throbbing when the symptoms worsen, and the pain increases when moving the affected limb and even affects sleep. In the later stages of purulent dactylitis, local skin necrosis and whitening may occur, making it difficult for the wound to heal. If the result of the blood test is elevated white blood cells and high fever, it can be judged as purulent dactylitis by combining the symptoms of the finger. Purulent dactylitis is mainly caused by infection with Staphylococcus aureus due to nail fungus and local stab wounds, which not only leads to abscess and pain in the finger, but also causes osteomyelitis in severe cases. It is advisable to go to the hospital and ask your doctor to differentiate between nail infection and pustular dactylitis, and once diagnosed with pustular dactylitis, to take timely treatment to avoid aggravation of the condition.