I just learned this neat photoshop tip. You may have already known about this. If you have just keep it to yourself and don't blow my bubble. LOL. It's a good way to remove dark circles from under the eyes. I also used it to get rid of some of the shiny parts around my nose. I found this on photoshopmama.net. Duplicate the background. Create an empty layer above the background copy. Get an Airbrush soft round medium size at 100% opacity and flow, and Option/Alt click on nearby lighter color to sample for foreground color. Airbrush over the dark circles. Follow up with a Gaussian Blur to soften edges but not negate the coverage effects of the concealor. Imagine if you were putting on concealor in the real world...so it's not meant to look natural at this point. It's just a base to compensate.