I don't think there's any way to turn off the highlighting itself, short of editing the config file.  (It's plain text, I believe, so you can do it.)

 Also, you'd be better off growing the hair on a skullcap rather than on the head of the figure.  (There are various free skullcaps out there, or you could use the ones that come with the P6 dynamic hair props - just delete the hair that's already on them.)  That way, you can save it to your library and use it with other figures.