Yah, that's what happens. The material editors will edit the head or the body. If the face type and skin isn't aligned well with the parameters of the body type and skin you get a line and a different colored head vs the body. If you read through the links turbojoe posted or search through the site you'll see it's an issue that comes up often. Limitation of the game I guess. The other issue is the hands where the fingers are lighter than the rest of the hand.I change face skin type - nothing happens.
When i change face type it reverts the material editors sliders from the bright skin i made back to dark that comes with the face
i dont have the neck problem with the skin that comes with the face (dark), it only becomes the issue when i brighten the face in material editor.
I seriously dont know what to do to rid off the dark skin face
You can mitigate some of it by playing around with the sliders but ultimately it might not come out as you want.
If you'd like you can post the card you're having trouble with and maybe we can see what specific issue you're having.