With no other signs of a RI and the imminent shed I would not go to the vet. Very commonly snakes get a popping sound as they go through the shedding process.

I very much doubt the snake got anything from the skin.

The fuzzy movement sounds like it was just old and started to mold. While not great it is also no reason to go to the vet.

Is there any other reason you think a vet visit is needed?