Those grayish spots...
Oh I would guess those are from the increase in humidity.

Sometimes we see a larger (size of a dime maybe) dark spot, and it’s usually an indication that the chick tried to pip and broke the membrane, but not the shell, and a little moisture got between the membranes. Happens more often with ducks. I think yours is just a slightly porous shell. Doesn’t look like a problem to me.