Just happened to see this... If its not warm to touch, reddened and your not spiking a fever (could be mastitis) is prob just a plugged duct. I got them all the time w/ my daughter years ago. Basically I got in the shower and let hot water pound on the area, the honestly expressed from the nipple/aereola until it started to come out like a thin piece of spaghetti. Often it was an inch or more long and soon as it unplugged, the blocked milk up in the duct will come rushing out in a stream till its empty.
I stopped wearing bras and was careful of anything pressing on that one area but it happened often. I got to the point that I just knew what to do and didn't worry.
But IF you start getting the first posted signs, call your doc asap.
Lazy on the couch so sent from my iPhone using DS Forum