Diabetic Neuropathy (Nerve Damage)
Over time, diabetes can cause nerve damage that produces symptoms of numbness, burning, or pain. If your skin becomes numb, you may not notice small wounds that could grow to become bigger health threats. Check your feet and hands daily for redness, calluses, cracks, or skin breakdown. If you notice any of these symptoms before your next scheduled visit, notify your health care provider immediately.
Source: http://www.webmd.com