If you have a sudden sharp needle-like pain in one nipple, take a look at it and see if you can see a spot just like this on the face of your nipple. This is what is called a milk blister or “bleb.”  Basically, it is a thin layer of skin blocking a milk duct. The milk backs up behind the layer of skin and it HURTS! It is possible to have a white spot on your nipple that looks like this without any pain at all.  If you have a non-painful white spot, leave it alone.

Sometimes, milk blisters are coupled with plugged ducts because they are blocking the milk from getting out of one or more milk ducts causing a back-up. Here’s what to do about a milk blister: