BLUE TONGUE SKINKS

Hi everyone,
I attached a photo for reference. My BTS has a bit of crusty and his eye isn’t opening completely. His mouth also has some kind of dryness and sore. Is this due to the humidity? I woke up this morning and his tank dropped to like 20% so I sprayed to get it back up and I’m purchasing a fogger machine to manage it better since my home is so dry. But is this what is causing his eye issue and mouth issue?

If your humidity is that low it's definitely an issue there, but I would suggest a vet check in case of possible infection.

What type of skink is this? I can't tell by the picture. I would get a vet visit asap to make sure there is no sign of infection going on.

It appears Merauke or some other indo, Jan. More than likely humidity issues.