A milk blister (also known as a blocked nipple pore, milk bleb, breastfeeding blister, or nipple blister) is a small but painful spot that many moms deal with. It happens when milk gets trapped under the skin at the nipple opening. While usually harmless, it can make nursing very uncomfortable.
A milk blister often looks like a tiny white, clear, or yellow dot on the nipple. Sometimes it’s flat, other times it bubbles up like a blister. Many moms describe sharp pain right on the nipple tip, while others feel it deeper in the breast.
If the spot looks red or brown, it may be a blood blister caused by friction, not milk. Blood blisters usually come from poor latch, incorrect use of nipple shields, or strong suction while pumping.
Several things may lead to a milk blister:
There are usually two forms of a breastfeeding bleb:
The treatment of a milk breast blister is similar to that of plugged ducts.
The following can be done for a few days until the blocked nipple pore clears.
1. Moist heat: An Epsom salt soak, done four times daily (one handful of Epsom with every 2L of water). Remember to rinse your breasts afterward to remove the saltiness. You can add a moist, hot compress after pumping or breastfeeding too. Cold compression can be helpful as a pain reliever between feedings.
2. The blister might open on its own, but if it doesn’t, you can:
3. Clear the duct: Get your baby to breastfeed afterward; this will drain the duct (you could also pump). Don’t be alarmed if you notice some thick, stringy milk while expressing.
4. Prevent infection: Use an antibacterial cream (Bacitracin) after nursing and wash again before the next feed.
Seek care if:
If the milk blister does not heal, keeps coming back, or you’re unsure if it’s a blister, thrush, or herpes, reach out for help. Herpes blisters look different but can be mistaken for blebs—and they’re contagious. Always check with a provider if you have a history of herpes.
A milk blister is painful but usually not serious. With gentle care, most heal within days. If the pain lingers, you don’t have to manage it alone. Reach out to a lactation consultant or doctor for guidance.
Some may resolve naturally in a week or two, but treatment can ease pain and prevent complications.
Good latch, frequent feeding, soft bras, and moisturized nipples help reduce risk.
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