Yellow spots, but only on one plant... Help?

Punkturtle420

Active Member
Hi, new grower here,
This morning I was doing a little inspection and noticed that one of my plants, and only one, suddenly has all these yellow spots! after much research and already instilled fear living in a desert, I thought spider mites. after inspecting the underside of the plant where the wounds were I noticed teeny tiny black spots.
I kinda squeezed and scraped the leaves and nothing smeared, and they didn't really come off. I stared at them forever, blew on them, and touched them and nothing moved. They honestly look too small to be mites, (could be denial) or maybe the beginning of a calcium deficiency.
also no webs, and besides the yellow spots, shes growing absolutely beautifully, can anyone help me out?

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