I suspect they may be tiny air bubbles in the plastic or protective coating. I've noticed them on a few occasions.
I had some Blu-ray discs years back that had fingerprints on them. I used a terrycloth type of microfiber cloth to clean the discs. It left a bunch of adhered fibers that I could not wipe off for some reason. I was forced to rinse them under cool water to remove the fibers. After patting up the remaining water and letting them air dry, I noticed much such minute speckling over much of the discs surfaces, but to this day, it has never affected their playback in any way.
Beyond that, I wouldn't really know.
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