I claim the ornamental design for a face mask, as shown and described.
FIG. 1 is a front side view of a face mask, showing my new design;
FIG. 2 is a back side view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a top view thereof; and,
FIG. 6 is a bottom view thereof.
The dashed lines shown at the bottom of each eye feature in the face mask indicate a foldable section of the face mask and are considered part of the claimed design.
The solid lines in the interior region of the Face Mask indicate a slit and are considered part of the claimed design.
In FIGS. 1 and 2, the mouth portion of the face mask surrounded by a solid line is a through hole.