Pest or Deficiency?

flowerz

Member
So a few of my plants have these white spots. I've taken a microscope to the leaves and I can't see anything moving or with legs or anything. The spots don't wipe off either. under the microscope they look like little empty pockets. I've attached some pictures so hopefully someone knows what the heck is going on.
Oh also, the plants next to each other have these spots, but the plants on the opposite end of the grow room don't have these spots either. So I have no idea if it's a pest or a deficiency.
 

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