This video by IceFlowStudios on YouTube talks about 4 different Photoshop tools that can be used to retouch images: the Clone Stamp, the Spot Healing Brush, the Healing Brush and the Patch tool.
I would just like to add a few things regarding some of the tools:
When you follow along the tutorial, check the Healing Brush tool options to verify that for the Source options, Sampled is selected. The other option would be Pattern. Selecting the Pattern option lets you retouch areas based on a pattern which you can select from Pattern pop-up palette.
In the Patch tool options, you can choose to patch the source or to patch the destination. In the example demonstrated in the video, the source was being patched - the area that was originally selected was retouched. If you choose to patch the destination, then it would work the other way around. The area that you originally select will be the area to be sampled from, and the new area that you drag the selection to will be retouched.