Okay, it looks like the Christina Hair cap is casting a shadow? Is there a way to turn off the Cap, or a fix for this? I've attached a pic of my figure with and without the Christina Hair to show that the discoloration is only there when the hair is applied. What causes this?

If the hair comes with Iray and 3Delight settings are you using the right ones?

I had to check, but I was using the Iray texture which would be correct. It must have been a shadow cast from the hair (onto the cap only?) because I moved the light source and the discoloration went away. I have no idea. lol

Could be some kind of clipping issue. Try applying a smoothing modifier to the hair (if it doesn't already have one) and adjust the iterations for collision and smoothing as needed. Alternatively you can mess with the adjustment morphs that come with it (forehead depth maybe?)

I just checked this and it's not an issue with the hair itself. But you can select the hair, go into the surfaces tab and select just the cap. Then set the Opacity (for 3DL) or Cutout (for Iray) slider to zero. That will make it invisible.