I have exported CC4 actor to Blender. All looks good except the eyes. I figured out the black in the eye, you have to switch to PBR material. The next problem is the red glowing around the eyes. It seem to be on any character I import from CC4 or iClone. It only shows on Cycles GPU rendering. The top one is from CC4 and the bottorm is from Blender.

If you're rendering in Cycles you should switch the materials to cycles and rebuild in the Character Build Panel.
The reason being that the subsurface effects in Cycles are much stronger than in Eevee, which causes the dark shadows in the eyes to spread too much and highlights in the hair and skin to be much too bright.