Possible Clues:

• Facial hair
• E.g. Jerry covering Tom up with horse hair
• Face down
• Imperative to include ring, a revolutionary facial adornment
• Hair on upper lip
• Mike, get rid of longing for facial hair
• Have to get around the round with pain on the face of it
• Weird shout came -- Poirot devoted a lot of time to it
• Strange case: mouth that may be found under one's nose!
• FH of computer operator accepting informal chat