Tal vez haya quedado una gótica de agua, y con la luz tal vez te halla marcado la hoja, no es nada para que preocuparse, se ve una planta linda y sana.
Exitos!!!
It is nothing, just a small blemish, quite common in cannabis.
No need to do anything and no need to worry.
Just remember, no plant will ever have 100% perfect leaves, 100% of the time.
One spot = no worries at all. If it spreads, or you get more and more of them, come back and ask the question again but I see NOTHING to worry about now!
Good luck!
Bit hard to say. But I don't think it's anything to do with droplet burn.. as right on the side you can c 2 little marks beside that drop.
It could be a very small sign that you might need to up your NPK ratios (feed) as she is looking a little pale and could do with some food.
Don't worry about it too much. Sometimr you get a odd spot that is an early warning.
It won't hurt to increase the feed a little and it should keep at bay any NPK issues at this early of your grows
Good luck pal.