Milk blister ... 15 almost 16 months in 😑

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So I suddenly have what I believe is a milk blister from nursing all of a sudden at 15 almost 16 months into nursing 😑. I extended nursed my middle and never had this problem. It’s a white bump on the nipple that really hurts when nursing and “burns” when not nursing 🤷🏻‍♀️😑.

Any advice ladies