This is a straightforward dream. The interpretation depends on its details. If the face was smiling, it signifies pleasant new friends, experiences and/or financial gains. Unpleasant or grotesque (unless amusingly so) faces portend loss. To dream you are washing your face denotes a necessity to atone for some past indiscretion; better make amends! To see the faces of strangers signifies an approaching change of residence. If the main feature of your dream was a facial blemish, you will have a variety of new opportunities to risk your reputation; if you can't resist, at least be very selective.