Several causes: The tip of the little finger miss incinerated by the lunar nerve. At the elbow the lunar nerve is relatively shallow and exposed to trauma of various kinds. People call this the crazy bone, but injury to the lunar nerve is what happens. Also the small digital artery that supplies it if damaged can cause numbness, but then often the finger tip is blue, white. If it persists over a week see your doc.
Answered 3/20/2017
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