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The nipple is commonly considered to be the nipple and areola together, but they are differentiated in medical terminology. The areola is the pigmented circular part of the breast, indicating where the mammary glands (that produce milk) are, and the nipple is the part in the middle that sticks out from the breast.

In human females, average outward projection of the nipple from the breast is 3/8 of an inch. Average diameter of the areola is about 1-1/4 inches, but it may be up to four inches in diameter.

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16y ago

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