Eli5: Why do areolas exist ? What is their purpose ?

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I understand the actual knob on a breast for a feeding purpose . Wouldn’t just that be enough ? Why the areola around it especially with a different shade of colour to the rest of the breast ?

In: Biology

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Areolae: The areola is the circular darker-colored area of skin surrounding your nipple. Areolae have glands called Montgomery’s glands that secrete a lubricating oil. This oil protects your nipple and skin from chafing during breastfeeding.Sep 5, 2023

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