Nikki (and others in the past) ask what it could be that feels like sinuses under the nipple.  I'm certainly no expert and I'm sure Cathy F. will have a more technical answer, but it makes sense to me that what you are feeling is the coming together of all the ducts variously placed throughout the
breast into one much smaller area leading to the individual duct openings on the nipple.  From all spread out to concentrated in one relatively small area, you are feeling all the ducts.  So yes, there would be more milk concentrated in that area, just in separate ducts, not gathered into "sinuses".
Is that close, Cathy?
Marsha

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Marsha Glass RN, BSN, IBCLC~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Mothers have as powerful an influence over the welfare of future generations as all other earthly causes combined.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~John S. C. Abbot~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



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