Hey, Kristen! It's me again.
My little girl had nursing blisters continually for the first couple months. One would fall off (gross!) and a new one would appear. Our latch was perfect too. Maybe because we both had oversupply our little ones had to suck extra vigoursly? This is what I posted to another mom asking about the blisters:
"Nursing blisters are caused by vigorous sucking. They appear as a blister on the center of the top lip. It may be swollen and your baby's lips will be chapped. My little one had several in the early weeks, both on the top and bottom lip. They don't cause your newborn any pain and will disappear within a few weeks. (It was really kind of gross when the huge piece of skin fell off her precious little lips!)"
They will most likely be disappearing for good in the next few weeks.