White spots on fan leaves?

shimmz22

Well-Known Member
Hello all i currently am on day 51 of my autoflower grow and am into late flowering. I noticed a white spot the other day on my fan leave and didnt really think anything of it because it was quite small. But then today a few other plans i noticed a couple of white spots. When i blew on the spot white powder came off. Anyone have any ideas?? I hope its not mold...

If it is mold like other sites are trying to tell me can i just leave it be and lower the temps and increase ventilation, will that maintain it?
 

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