Leaf markings

[demcc3]

I'll probably get a dozen different answers but do these leaf marking appear as though they might be from alien life forms (some type of pest) or improper feeding? These markings only appear in this certain small area.

I have 2 Blue Dream plants. I could have sworn originally that I had purchased photo/feminized seeds but these are definitely auto at about 6 weeks old

 

[Gingerbeard]

As opposed to a dozen of the same answers?
Looks to me like old damage that happened when the leaves were younger. If you fold each of the leaves, the damage is bi-lateral. The damage is also about the same distance from the stem. Also, you said it's only in one place.