>>397103187
Also if you use substance painter to author your textures, you can turn up the margins or set it to dilate infinitely
Chances are you're using a booth or MMD in which case just paint around the UV's a bit with a similar color and the problem will disappear.
If the UV's are very close to the texture edge, just set the texture sample mode to Clamp in Unity and that will also fix a lot of these issues.