The areola is the pigmented ring around the nipple. It can be from one centimetre to five or more centimetres in diameter, and changes from a delicate pink colour to brown early in pregnancy and never quite returns to its original colour. The areola is spotted with small buds called areolar glands. The oil-producing glands are also known as Montgomery's glands (named after the obstetrician William Fetherston Montgomery who identified them). The glands sometimes rise like pimples over the skin and may enlarge during pregnancy. Research Areola
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