During puberty: Montgomery's tubercles may appear during puberty and certain phases of your menstrual cycle, as activity in areolar glands increases with the amount of estrogen in your body. 2.

Do Montgomery tubercles come and go in early pregnancy?

Those bumps are Montgomery tubercles — glands that release substances to lubricate your nipples and alert your baby when it's time to eat. Hormone changes during pregnancy can cause these glands to enlarge. They're nothing to worry about, and will go away once your hormone levels are back to normal.

Do you have to be pregnant to have Montgomery's tubercles?

You can notice Montgomery tubercles even if you aren't pregnant, so you'll still need a home pregnancy test and confirmation from your doctor's office to make sure a baby's on the way.