The Healing Brush tool comes in the category of the retouching tools(Repairs images or restore a portion of an image) in Photoshop that repairs the imperfections, blemishes in an image. It includes,
1) Healing Brush Tool
2) Spot Healing
3) Patch Tool
4) Red Eye Tool
In this section written below you'll come to know about the Spot Healing Brush Tool.
It is used to discard the imperfections in the photos. The tools samples pixels around the area you are trying to retouch. It matches the textures, lightning and the transparency of the sampled pixels with the pixels supposed to be healed.
When you select this tool and drag the mouse cursor over. Initially the area becomes dark grey on clicking & later it gets merged with the background on release of the mouse
The menu options allows you to play around with the,
Pressure for the Brush
The PROXIMITY MATCH allows you to make use of the pixels around the edge of selected area
The CREATE TEXTURE allows you to create texture by using the pixels of the selected area
Thus, the Spot Healing Tool is a quick & easy to go method used to repair an image.