Jaden and Willow

I would also make sure you have good air flow too, that will prevent bugs from wanting to come back, they thrive on moist areas with no/little air flow

Definitely from the video looking like eggs or really small aphids. I used to have a really bad issue with aphids on my tomato plants when growing inside and I picked up some pesticide spray from Doctor Doom, never seen any since. I noticed a few in the first few weeks of my grow when I had my vegetables also in the tent before I move them outside one application never had any ever come back. And the stuff apparently is safe to use two weeks prior to harvest.

Just keep a close eye on it. My first guess is mold. If it's only a couple leaves, just get them out of there. Mold, eggs, salt... just get them away from the rest of the plant. If it's all over, just keep a close eye on it so you can diagnose. Incidentally, a mold treatment will probably kill eggs too...