The ornamental design for a skincaredevice, as shown and described.
1. Skin Care Device
1.1 is a front perspective view of a skin care device;
1.2 is a front view thereof;
1.3 is a back view thereof;
1.4 is a right side view thereof;
1.5 is a left side view thereof;
1.6 is a top view thereof;
1.7 is a bottom view thereof; and
1.8 is a front perspective view in a position of use.
The broken lines in figure 1.7 shown immediately adjacent to the claim represent the bounds of the claimed design while all other broken lines in figure 1.7 are for the purpose of illustrating portions of the skin care device; the broken line showing in figure 1.8 is for the purpose of illustrating environmental structure; the broken lines form no part of the claimed design.