ExplanationThe vermilion zone, not the philtrum, is also called the “red zone.” The vermilion zone, not the vestibule, is also called the “red zone.” The vermilion zone is also called the “red zone,” and is the area of the lip that is red in color. The vermilion zone, not the vermilion border, is also called the “red zone.” The vermilion border is the line between the lips and the skin.
