I have heard other people talk about this on different forums. So, you are not alone. I don't recall any good advice, or solution about this, only that it is more common than one may think. i hope that helps a little.
How can you tell this odor is coming from your breast and not your underarm ?? If it is due to some discharge from the nipple then you really should see your Dr. and some treatment can be instituted. You can just forget being embarassed to approach your Dr. about this; Dr.s don't give things like this a second thought. Regards .....