What is a milk pimple?
Milk pimples look like white or cream-coloured areas on the nipple face. They are typically 2 millimetres (1/8 inch) and can be flat or raised. Some pimples can be even smaller and others can be larger, affecting up to half of the nipple face. Most are circular but some can be star-shaped or irregular. New milk pimples can be very painful when a baby latches and hurt during the feed. They come on suddenly and there can be more than one present at the same time. Milk pimples are more common in mothers with a large milk supply and are associated with other problems such as plugged ducts and nipple vasospasm. There is virtually no research on what causes them or how to treat them. They may be caused by milk leaking from a duct under the skin or by the milk clotting. The body reacts to this with inflammation, which causes pain.