Brown/Red Spotting or Burning on Maple Leaves

Seattle, WA

Hello all! I've tried to research this one but it's a tricky one to find the right keywords to avoid pulling in all sorts of results that are obviously not relevant. Anyhow - I have a very small maple tree that I've been trying to grow from a seedling found in my yard. It was growing very well, and took to up-potting last year nicely. This year it grew nicely through spring and then sort of halted. Over the past few months the leaves have gotten sort of a rust brown/red scale on them. They're not bumps like gall mites produce, and they don't look like brown leaf scorching. I don't see any obvious signs of pests, but perhaps I'm missing them?

I'm at a loss here and hoping to get some thoughts and advice. Thank you!

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