Final answer:
Sallow skin has a yellow hue due to low levels of hemoglobin or carotene. Additionally, liver dysfunction can also cause the skin to appear yellow.
Step-by-step explanation:
The hue sallow skin has is yellow. Sallow skin refers to a pale or yellowish complexion, usually caused by a low level of hemoglobin or carotene in the skin. Hemoglobin is a red pigment found in red blood cells, and carotene is a pigment that gives skin a yellowish tint. In cases where the liver is not functioning properly or there is a buildup of bilirubin, the skin may also appear yellow or jaundiced.