i am having an issue which i think resulted frm pumping on too high a setting. i noticed that only on one nipple there is a whitish / yellow substance (skin? milk? not sure) in the cracks of my nipple. i have not been able to remove it from washing / wiping the skin. i was wondering if anyone else had experienced this and had suggestions on how to treat? i don't believe it's thrush -- i have no other symptoms (nor does my son). i also don't believe it is a bleb, it is bigger than simply a whitehead on the nipple, and it doesn't seem to be blocking milk flow. any thoughts would be greatly appreciated! thank you!