If you have been bitten by an insect near your nail and your finger is swelling, there are a few steps you can take. First, make sure there is no infection present. You can then apply ice to reduce swelling and take an antihistamine such as Benadryl or Reactine. By tomorrow, your finger should start to go down. However, keep an eye on it for any signs of pus or increasing redness in the next few days. If these symptoms occur, it is important to consult a pharmacist. Wishing you a speedy recovery!