It's the nipple on my right breast.
Nipple pain and soreness can stem from a number of causes, usually hormonal. You may find this stinging, or soreness, happens just before your period, then disappears; this is normal. Many pre-menopausal women experience fibrocystic change, a benign (not dangerous) condition characterized by breast pain and nipple soreness. And some women report pain relief by avoiding caffeine; this is something you might try.
Sore, stinging nipples (on one or both breasts) are also a typical sign of pregnancy. Is there a chance you could be pregnant?
If the stinging sensation evolves into more pronounced pain; or if you see any signs of infection (swelling, redness, discharge, heat), then it would be best to see a doctor for treatment. In the meantime, please read our post Nipple Issues: When to Worry, When to Wait for more good information.
You could consult i doctor just to make sure everything is alright, but I had the same thing happen to me and I told my mom and she said it was normal. What I did was got some Vaseline or Petroleum Jelly to sooth the pain a little bit. It didn't stop hurting right away it was about five minutes or so when the stinging stopped. Just make sure not to irratate them by rubbing are scratching them. Hope the stinging stops, just letting you know you are not the only one!
Thanks for your suggestion about what helped you. I'm sure other readers will find your idea useful. Whenever a home remedy like petroleum jelly helps, the problem is probably not a dangerous one. Of course, it's good to check with a doctor for breast changes that don't go away within a reasonable period of time, especially if they are in just one breast. I'm glad you found the solution to your stinging.