Finger belly that is, the belly of the finger, swollen may be common causes are mainly purulent dactylitis, nail groove inflammation, poisonous insect stings and other diseases caused. 1. Purulent dactylitis: Purulent dactylitis is due to injury to the fingertip, bacterial infection resulting in purulent inflammation. Purulent dactylitis causes severe pain in the fingertip. As the condition worsens, the tissue swells and may cause the finger to become enlarged. It usually requires surgery to drain the pus, regular dressing changes, and antibiotic treatment with cefuroxime, ceftriaxone sodium, etc. through intravenous access. 2. Inguinitis: Inguinitis is mainly caused by pathogenic bacteria infection of the paronychial groove and the bottom of the proximal nail groove, resulting in redness, swelling, heat, pain and other symptoms of the tissue. 3. venomous insect stings: due to venomous insects with venom on the body or in the body, after stinging the finger belly, there may also be swollen finger belly. Finger belly swelling can also be seen in other diseases, it is recommended to consult a doctor in a timely manner, after a clear diagnosis to be treated accordingly as prescribed by the doctor.