what type of physical activities do you do?
what type of work do you do?
can you describe the pain? what makes it better, worse?
any medications or medical problems
you're describing irritation of the ulnar nerve. It begins as nerve roots in the cervical spine. Branches off the brachial plexus in the shoulder. Passes along the inside of the elbow and then beneath the retinaculum in the wrist. Typically the more specific the symptoms the more distal the problem. In other words, pins and needles only in your pinkie would suggest problems at the wrist. Pins and needles along the medial part of the elbow and pinkie suggests problems at the elbow...etc.
the ulnar nerve passes through the elbow right at the 'funny bone'. Most commonly irritation to the nerve results from trauma (inflammation) and arthritis.
The symptoms could be from simply having slept funny last night all the way to ulnar nerve entrapment.
I recommend you see your doctor to have it evaluated. He may send you to a neurologist for nerve testing to identify the exact location of the problem.
it is a collection of nerve roots in the neck. passes through the shoulder then through the elbow then through the wrist.
I would expect your symptoms to include more than the ulnar nerve if a kyphosis was the reason. The nerve roots that come off the cervical spine also create the radial and median nerves. This would give you pins and needles in the entire hand and forearm if kyphosis was to blame.
I don't think that's the reason, but I cannot give you 100% reasurrance because I can't do an exam. You should see your doctor for the exam.