Sometimes there is a white spot or red spot immediately after nursing due to the position and suction of the baby. If it is not sore and goes away shortly after feeding it probably isn't a problem. If it is sore or prolonged you may need to get it investigated by a lactation consultant or medical provider. In deed it does sound like milk blister. A milk blister, or blocked nipple pore, is also called a bleb or nipple blister, or simply "milk under the skin." It occurs when a tiny bit of skin overgrows a milk duct opening and milk backs up behind it. A milk blister usually shows up as a painful white, clear or yellow dot on the nipple or areola, and the pain tends to be focused at that spot and just behind it. If you compress the breast so that milk is forced down the ducts, the blister will typically bulge outward. Milk blisters can be persistent and very painful during feeding, and may remain for several days or weeks and then spontaneously heal when the skin peels away from the affected area.
Milk blisters are thought to be caused by milk within a milk duct that has been sealed over by the epidermis and has triggered an inflammatory response. The underlying cause of a milk blister may be oversupply, pressure on that area of the breast, or the other usual causes of plugged ducts. Latch, suck, and or tongue problems may contribute to blisters because of friction on the tip of the nipple.
Thrush (yeast), can also cause milk blisters. Thrush occasionally appears as tiny white spots on the nipple, but can also appear as larger white spots that block one or more milk ducts. If you have more than one blister at the same time, suspect thrush as the cause. Yeast is often accompanied by a "burning" pain, and the pain tends to be worse after nursing or pumping (whereas a plugged duct generally feels better after the breast has been emptied).
Recommended treatment for a milk blister usually consists of four steps: apply moist heat prior to nursing, clear the skin from the milk duct, nurse or pump with a hospital-grade pump, than follow up with medication to aid healing. You may need to repeat this for several days (or longer) until the plugged duct opening stays clear.
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