What about your toes?
Are you over-using your fingers?
Is it the entire fingers or just the tip of the fingers?
What color are they? Red? Blueish/purplish? White/pale? Normal?
Have you been bitten, scratched, or injured it in some way?
Is it heat induced? (are you particularly hot when you noticed it?)
Is it Cold induced? (are you cold?)
perhaps answering these could help others and myself give you ideas of what it could be. However, if this symptoms continue to persist, you need to get it checked out by your primary physician.
Good luck