Thanks bmillard for asking this and also to the rest of you guys that came up with an answer!
I saw this on the top 2 leafs on 1 plant of my plants today, thing is I did water it yesterday so this makes perfect sence to me now cause I found this thread. All of you can probably tell I´m a noob, so all I learn from you experienced growers here at rollitup is a part of the learningprocess for me, perfect. Thanks!