The pigmented area around the nipple, or areola, performs certain functions.
The Montgomery glands located there release an oily substance that protects the tender skin of the breasts from irritation and cracks when feeding the baby.
Areolas also contain nerve endings. Their stimulations during breastfeeding triggers the release of the hormone oxytocin.
They may be different in shape (round or oval), colour (from light pink to dark brown), and diameter 1.18 - 3.93 in (30-100mm).
Sometimes, the aerolas are asymmetrical, which is perfectly normal.
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