Looks like some sort of deficiency; Or, a fungus? Hard to say without information; Such as, temperature, humidity, and nutrient 's used.
PLease help us to help you. 
Day in my roof, the temperature close to 50 degrees, 60 degrees at noon back, but before they are good, that is out of the question these days.
A few days before they are well.
I see some are good, some are bad. I am still not sure what you are asking.
What are you using for nutrients?
They planted at different times, different varieties, I use a Chinese-made fertilizers.
If you have good PH in the soil and are controlling TDS/PPM and the spots aren’t spreading you are probably good. It was likely just a nutrient lockout or imbalance that you may have corrected.