Breastfeeding

Confused about pump flange size

I have no idea if I'm using the right flange size for the Medela PIS.  I have the 24mm it came with and I purchased the next size larger the 27mm.  With the 24 I experienced some nipple blanching so I thought I needed a bigger size.  But with the 27 I'm getting a pink tender ring at the base of the nipple.  Any one have any suggestions? 
BabyFruit Ticker
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