Hello,
You have hurt the ulna nerve that supplies this region. Yes, the nerve will return to normal in time. The standard time is 1 month, but sometimes it can take as long as 6 months for a full recovery.
You can exercise your arm regularly - muscular movements help to stimulate nerves for a quicker recovery. Take a multivitamin supplement, especially one containing high doses of Vitamin B1, B6 and B12 as thses are necessary for the formation of nervous tissue.
If the feeling does not return in 1 month, please consult a neurologist for a full examination and a nerve conduction velocity test.
I hope this helps.
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