The top of my left hand is numb between the index finger and the second finger.?

and when I strech my arm out to get somthing I get a painful pulling sensation the skin is num to the touch almost like when a limb falls asleep.Is it a nerve or a circulatory blockage.
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Nobody here can answer this question. It can only be answered by a doctor who has examined you and perhaps run tests. Period. Get to a doctor.