Final answer:
The nurse should highlight Petechiae as an abnormal skin change to the health care provider, as Melasma, Linea Nigra, and Spider nevi are considered normal skin changes during pregnancy.
Step-by-step explanation:
Skin Changes During Pregnancy
During pregnancy, it is common for women to experience various skin changes due to hormonal alterations. Melasma (often called the "mask of pregnancy"), Linea Nigra (a dark line running from the umbilicus to the pubis), and Spider nevi (small, spider-like capillaries that can appear on the skin) are considered normal changes. However, Petechiae, which are small red or purple spots caused by bleeding into the skin, should be flagged as abnormal. Petechiae could indicate an underlying condition that needs medical attention.