Hard to tell by the pics....have you looked under the leaves for mites??.....usually those spots are small and white/greyish but I've seen brown later on....usually bigger rust colored spots are magnesium deficiency but yours look to small for that telling me its a pest problem....if they get big and brown add about ,1tbs Epson salt to a cup of hot water to desolve salt and then put that into a gallon of water and feed plants.......will fix in a day or two....you can add neuts with salt its ok either way