What can cause swelling and tingling in your index finger?

Writing an cause swelling in the index finger, especially if you hold your pen in an unusual way to most people.
If you have sores and cuts on the side of your fingernail, it could cause an infectious swelling on the finger, which can easily be sorted by some savlon.
Sometimes, an ingrown nail can cause the finger to swell and go red. This inflamation will gradually go down over time.
If this swelling continues to occur, take a casual rip to your local doctor for some help and advice.
Hope this will help.