Is it ensure, insure, or assure?
c.1600, "face to face," from French facial, from Medieval Latin facialis "of the face," from facies (see face (n.)). Meaning "of the face" is from 1818. The noun meaning "beauty treatment for the face" is from 1914, American English.
facial fa·cial (fā'shəl)
Relating to the face.