this is the result of mites feeding on a plant. They usually feed on the shaded undersides. Causes scabs on the upper sides. Small mite scabs look like this (russet, spider mites, and others)
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Large mite scabs (like aphids and such) look more like this.
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In pretty much all mite infections, youll see this before you actually see deficiency or deformity from them.
Not syaing you dont have mites, and that those arent eggs. Just that if you do, thats not whats causing your other symptoms.