Is this mold or light burn?

I recently had a high humidity issue that I just fixed yesterday. Now I’m at a steady 50/55 RH whereas before, it would get up to 80. I also just bumped my lighting up to 75% about a week ago and will be putting it on full blast in another two weeks.
 

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Could be wind burn, light burn, nute issue, and so on.

We don't know enough about your grow to give a straight answer.

If it doesn't rub off its not a fungus.
 
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