These two prominences are called the labia Externa, or external lips.
Another British species, viz., the little Earwig (labia minor), is also of wide distribution.
from Latin labia, plural of labium "lip" (see lip (n.)). Specifically of the folds on either side of the vulva from 1630s (labia pudendi).
labium la·bi·um (lā'bē-əm)
n. pl la·bi·a (-bē-ə)
A lip or lip-shaped anatomical structure.
Any of four folds of tissue of the female external genitalia.