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