Oho

She has a mask that looks like a skull,
You can see in the last panel that she's holding a skull-like mask

Now that I looked back, she really have flesh.

If I recall correctly, it has been said in a previous chapter that she was wearing a mask and there are rumors that she looks unbelievably gorgeous when she doesn't have it on.

I don't remember that at all (⌒▽⌒). Haha, must be cuz I didn't paid much attention.