Indoor What can cause this?

[Freedom]

I know you guys get tired of answering questions, but............
I can't be sure of this, please help!

 

[namvet25]

Is it just on one leaf? Are you using nutes and if so what type.

 

[Freedom]

Straight Fox Farm. It's 2 leaves.

 

[namvet25]

I't looks like a little burn from nutes getting on the leaves,If it starts spreading let me no.