I got my new single electric mini pump (made by Medela) and tried it out. Both of my breasts have sustained injuries. They look like small blisters, oval-shaped, on the areola right next to the nipple. I used the same breastshields that I've always used with my PIS and have never had a problem with their size. Is it possible that this machine I just got only creates suction on part of the breast and not all the way around? Nursing is painful right now. After ds is done nursing, I put a little bm on the sores to help the healing and let them airdry, which actually seems to be helping quite a bit!