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Hello I'm Dr Chip
Is it only his index finger that's involved here--none of his other fingers?
Any pain in that elbow?
This is caused by an ulnar nerve problem--likely a nerve compression in his elbow even if there's no elbow pain
Since it's gone on for two days he needs to have his doctor check it out with an exam and an MRI of the elbow
Usually physical therapy resolves that problem
Please let me know if you need any more information