My pinky and ring fingers get pins and needles sometimes. What could be the cause of this?

Compression of ulnar. Nerve at wrist or elbow, large breasts, brachioplexus injury or neck spine disease or even very localized brain injuryt.
Ulnar nerve. The ulnar nerve supplies feeling to part of your ring finger and the pinky. It travels from your neck, across your elbow and then into the palm of your hand. A common area where it can get irritated is at the elbow. Avoid leaning on your elbows or bending them excessively to minimize irritation there.

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