These are probably just Montgomery glands, which i wrote an article about which you can read here: http://www.associatedcontent.com/article/2215435/why_nipples_have_bumps.html?cat=69
Montgomery glands are usually the same color as your nipple, and if you squeeze them (don't do that tho) sometimes white stuff will come out, which is simply excess oil. The itching could be simply caused by extra oil. I suggest you read my article for more information.
If they are in any way discolored or paintful, however, you should see your physician immediately, just to be safe.
Important:
We hope you find this general health information helpful. Please note however, that this Q&A is meant to support not replace the professional medical advice you receive from your doctor. No information in the Answers above is intended to diagnose or treat any condition. The views expressed in the Answers above belong to the individuals who posted them and do not necessarily reflect the views of Remedy Health Media. Remedy Health Media does not review or edit content posted by our community members, but reserves the right to remove any material it deems inappropriate.
Please don't worry about cancer. At your age, and with the symptoms you describe in both breasts, it's totally unlikely. This is most probably a hormonal issue; if it doesn't disappear within a month, then you might want to see your doctor and find out what it is (ditto if it gets noticeably worse; you'd want to get some relief). In the meantime, please read our post on nipple issues; I think it'll help set your mind at ease. Good luck - PJH