Fitting shells or layers

MJW

Possibly the wrong title, but I am having problems with something akin to poke-through when I try to add hair and/or something like the Wet Skins for Iray product by SimonWM. See the image for the effect, in which the eyebrows and the lips are untouched. I am sure I ahve been todl how to solve it by one simple parameter change on my figure, but search as I may I can't find the solution or replicate it. The face is one of my own creation using the normal Daz morphing dials etc, and I really don't want to have to abandon this character. Your ideas will be welcome.

Thanks

PS the black is due to catching the nvidiairay as it is drawing using Draw Settings - it does go, (but not always, I find).