There are a few ways to darken a small area in Photoshop. The first way is to use the black and white filter. This filter will darken the entire image, making it look like it has been darkened by a black light. The second way is to use the dodge and burn filter. This filter will only darken the area that you have chosen to be darkened, and it will not affect other areas of the image. The third way is to use the Levels tool. This tool will allow you to adjust how much light or darkness is present in your image, making it look more or less like it has been darkened by a light source.
