[Normally, he would be putting two and two together by now, but he's fascinated (and concerned) by this whole set of developments. He sees a little liquid come away on his fingertip and he pulls it away, leaning in to examine it.]

...interesting...this obviously isn't a human bodily fluid, but...

If you can feel through those spots, this isn't a parasite.

You said you had control of them, the other day, didn't you?

[He'd like to watch what happens when they're extended more closely.]