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Is there any discoloration of the finger?
That could indicate a circulatory issue, which could have been caused by holding the can.
I've had instances, few and far between (thankfully) where I've had fingers on both hands go through (what I perceive to be) similar periods of "numbness".
All events were the results of trying to carry 3 plastic grocery bags of 2-3 litre bottles of soda (6 bottles total). The "handles" of the bags were all in the same crook of the finger, and when I put down the bags, the finger felt like it was "asleep"/numb.
It did pass, but not immediately.
If it is the finger of the hand that held the can, and the handle of the can was held in the crook of the finger, it could be nerve damage.
If it doesn't show signs of getting better, even after flexing and exercising it, than definitely see a professional.
Good luck!
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