The ornamental design for a skincaredevice, as shown and described.
FIG. 1 is a front, left and top perspective view of a skin care device showing my new design;
FIG. 2 is a rear and bottom perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a top plan view thereof, shown enlarged in scale;
FIG. 8 is a bottom plan view thereof, shown enlarged in scale; and,
FIG. 9 is another perspective view thereof, showing with a handle band.
The broken lines shown in the drawings are included for the purpose of illustrating portions and environment of the skin care device and form no part of the claimed design.