A little over a week ago I began having a "stinging" or pins and needles sensation in my right breast, off and on, most days but not every day, and the sensation moves around...mostly on the outside of the breast or - as yesterday - between the breasts. There's no change in appearance nor does it feel warm. I have had a pinched nerve elsewhere before and can equate the feeling to that . I also am diabetic and wonder if it could be related to neuropathy. should I be worried?