I’m on my period.....help!?

The little bumps on the areola (around the nipple) are called Montgomery Glands. Anyways, my left breast has one of the glands sticking out far (like a big zit...ew) but it’s not a zit. It hurts bad when I touch it. Is it normal? Is the gland just inflamed or infected? Should I be worried? (it’s just one bump not all)
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