I had similar spots on a outdoor grow but they wiped off think something got sprayed on the plant on accident. You’ll need a scope down the road anyway to check trichomes. Don’t forget to check underneath the fan leaves as well for brown/black specks Incase it is spider mites.
i think you may have an insect that comes out at night and as a little chew of the surface of the leaves ,could be a grub of a small beetle,i dont think its Spider miteds the holes in leaves or to big ,,mac,