Simply select the layer with the fringe on it and go layer matting defringe and typically i defringe between 1 3 pixels depending on how much fringe it there.
What is matting in photoshop.
If you have an object that has been cut out with a mask you can use the color decontamination feature.
Hit ok and let photoshop do its thing.
Matting is a menu item in the layer menu used to edit pixels on the fringe of an image or new layer.
For example when a section of one image is moved to another anti aliasing can create.
Photoshop tutorial defringe tool.
Most images don t really have a need to use these tools but when they can be used it s great to know they are there.