The ornamental design for a siliconescalpmassagerbrush, as shown and described.
FIG. 1 is a perspective view of a silicone scalp massager brush showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a back elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines shown in the drawings depict portions of the silicone scalp massager brush in which the design is embodied that form no part of the claimed design.