| 
 | The ornamental design for a head massager, as shown. | |||||||||||||||||
FIG. 1 is a front view of a head massager, showing my new design;
FIG. 2 is a back 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;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a perspective view thereof.
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