To enhance your image's lighting, you may wan to try running the Auto Tone, which will brighten your image, and add a some contrast. You can apply the Auto Tone non-destructively by creating a Levels or Curves adjustment layer, then click the 'Auto' button in the properties panel. If you would like more options, Alt-click (Mac:option-click) the 'Auto' button to bring up the 'Auto Color Correction Options', and choose from the different algorithms.
Red blotchy skin can be difficult to isolate and color-correct effectively. Here is a quick but highly-effective way to retouch red, blotchy skin using Hue/Saturation Adjustment Layer and its Eye Dropper and Color Range tools.