My index finger & middle finger hav sudddenly become itchy & smollen,when i bend them it hurts & feels sort of blisterd on the sides where knuckles r?

Insect bite?: Sounds like you've either been bitten by something or contacted something irritated on your skin. Alternatively, you may have a skin infection starting such as a cellulitis of some sort. I think you should have this looked at in short order by a doctor. They want to start treatment of some sort...at least something symptomatic for the discomfort. Good luck.