Are those pics all the same plant? Doesn't look like anything of concern to me. Is it possible you got a little bit of nutrient infused water on that leaf?
I occasionally get a droplet here or there and it will effect the leaf very similarly. Sometimes the droplets evaporate leaving no trace of course. Aside from it looking visually unpleasent I've never experienced a negative effect otherwise.
Nothing serious just watch the nutes you will be golden.
I had these spots on mine just left it no harm done, but just kept an eye on them to be sure and im now about 3/4 weeks from harvest, healthy as can be
Dont worry to much