The spots on lower leafs might be mites. You checked the back of the leafs?
There was a mite issue very early on before I had proper air flow and the room was staying really hot, that was corrected, along with a cpl runs of different insecticides from the hydro shop, havent had an issue with them since.. your talking about the red dots?
I havent had mites that affect red dots on a plant, ive seen yellowing/black spots from them sucking the life outta leaves and shit but never red from mites.. my first few grows i had some bad mite problems as well so I like to think im familiar with them haha, have you had red spots from mites before??