SilverWook said:

The line between makeup and SFX can be hazy sometimes.

Yeah, There was actually some controversy around this very thing back in the '80's where the make-up artists union, I think, sued Universal for the credit Bottin was given in The Thing, not sure what the work of his was credited as or if they had to change it on later videoreleases etc. but it was probably Special Make-up or something like that.

Now when I think about it, was there even a Oscar category for best make-up back then?