Weird White Border thingy

Okay, so when I shrink a picture that I've cropped or whatever I keep getting this light white border. I usually just use a black pencil tool on soft light to get rid of it, but I hate doing it all the time. So is there a way to get rid of this white border without having to use a soft light layer all the time?

Example:



^^If you copy the picture, paste it onto a black canvas, and zoom in a bit, you'll see what I'm talking about.

Note: I use PS7