Bubble on nipple

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Hello! I’ve been breastfeeding for 3 weeks now FTM. On my right side my nipple has a weird bump/blister. I was pumping but my baby has been clustered feeding so I stopped.

I just recently change my flange size to 27mm but last pumped 1 1/2 weeks ago. As that’s what my lactation specialist suggested from the hospital.

It’s soft doesn’t hurt but makes it hard for baby to latch. Feels like air trapped or something.