Swelling of the index finger of the patient, the following reasons are common: First, purulent dactylitis: the index finger is stabbed by sharp objects, bacterial invasion after the formation of infection, and sometimes the formation of suppurative infection, the patient will have localized swelling, pain, activity restrictions, touching the pain will be aggravated by the symptoms of the skin, the skin temperature will be significantly increased, the local fluctuation of the feeling can also be formed. Through timely surgical treatment and anti-infection treatment, purulent dactylitis can be cured. Secondly, finger trauma: if the finger is hit, smashed, resulting in fracture, localized swelling, pain, activity limitation, X-ray filming can also clearly find the fracture line exists. After early manipulation of reset, immobilization treatment, can make the finger swelling symptoms get rapid relief. Finger swelling, must be early diagnosis, early treatment, to avoid serious adverse consequences.