Does the index finger hav joints on sides?

No . Not sure i understand the question exactly... But check this out: http://www.Healthline.Com/human-body-maps/index-finger.

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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. Read more...