Very healthy plant, but WTF is with this leaf ?

Hey and thanks for reading. Pics tell the story. Rest of the plant/crop very healthy but this one leaf. Outdoors in soil. Either Skunk or Headwreck (Mixed them up a bit). We had a 43 degree (Cels, In Australia) day on Friday but I moved it for the most part. No pests, leaf is connected to the plant solidly. Just worried that it might get worse or spread. In large pots Any clues? ,thanks, !st pic is the leaf, 2nd is the whole plant.

Not sure I've never seen that before. Dont fret over it though! It's a weed and will work it self out!

Yeah its kinda next to a fence. It looks burnt to me. Im wondering if an animal pissed on it.

Looks like white spots all over leaves, have you looked closely for critters? I had a bout with spider mite fuckers, looked identical to what you have going on