I've read something about this in the forums, although I can't find the thread.
("womanface_young",0xffe3e8ef,["hair_blonde"],[0xffffffff, 0xffb04717, 0xff502a19, 0xff19100c]),
This would be used as a tint that is applied to the skin texture of the mesh, although I haven't messed with that so I'm not sure how it works.
This is used to determine the hair colors. First two are for the hair color when the slider is on the left and the last two are for the slider on the right. I've added some "skins" and changed these so I can confirm.
You might try to change this to different values and se how that works. Good luck.