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.
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