My nipple aches and feels like the milk is blocked. Is this a milk blister?

Yup this Is a milk blister, or blocked nipple pore. It is 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. You can try the following to remove the blister: 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. Make sure bub is latching on the side with blister. Don't prick the blister - my Gynae said pricking will cause scarring and possible recurrence.