Answer :
Final answer:
During pregnancy, the areolae and linea nigra, a line of pigment from the belly button to the pubis, darken due to increased melanin production stimulated by hormonal changes.
Explanation:
During pregnancy, hormonal changes stimulate melanin production, leading to skin darkening in certain areas. The areolae (the darkened skin around the nipples) often become noticeably darker. This change is due to an increase in melanocyte-stimulating hormone, which works in tandem with estrogens. The same mechanism also creates a line of pigment from the umbilicus (belly button) to the pubis, known as the linea nigra. Darkening may not be limited to these areas; increased melanin production can also cause chloasma - a darkening or discoloration of the skin on the face, often referred to as the 'mask of pregnancy'.
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