Horror - It looks human except for

The thing is disguised as human, what mutant feature shines through to give it away?

1 – Their fingernails are thick, black and pointed.

2 – The eyes always face straight forward and never move side to side.

3 – There are slits on the side of it's neck that it's breathing through instead of their mouth.

4 – Down their spine there are barbs of bone protruding through the skin.

5 – The skin doesn't fit quite right and they keep tugging it tight on their hands and face when it stats to sag a little.

6 – When they speak their lip movement doesn't match the words quite right and if you look closely you don't see a tongue either.

7 – When startled they turn their almost completely around to see what happened.

8 – The ears and nose don't actually have holes, they go in for a bit but you can see they end in a layer of skin just inside.

9 – When touching them the skin is softer than it should be and even where there should be bones it is almost rubbery.

10 – It doesn't seem to notice stimulus on the skin. Like insect crawling on them, scrapes, cuts or even stuff like acid burning into it.