Thank you for asking Healthcare majic. My name is Dr Ehsan Ullah & I have gone through your query. you are experiencing sharp pain on skin, particularly on one side of the back .... The skin has been divided into many regions and each region is supplied by individual nerve ... the area / segment which is supplied by a single spinal nerve is called dermatome. The most common reason for numbness or tingling is a problem with nerve function, either because of injury to the nerve itself, or something is pressing on the nerve, or an imbalance in the body s chemistry interferes with nerve function. Most causes are not dangerous, but when muscle weakness or paralysis, then numbness and tingling should seek medical consultation immediately . Hope this may help you. Let me know if anything not clear. Thanks.