Hi, not trying to hijack, but I have the EXACT same problem. I am a cabinet grower. My cab is air tight except for the filtered intake and exhaust, and I only open the door once a day to check on the plants. These are in my basement and I spray the property for house bugs monthly (not in the cabinets and not when the fans are on). I am leading to believe that it is genetic somehow as this is just some random bag seed from some dank AND I have some oddly shaped leaves [see pics] , but I dont have any lesions, i just checked. The plant is three weeks into flowering, and seems otherwise healthy they could have been there all along for all I know, but I just pulled the plant out to move some leaves and do some trimming and noticed.
Could that lesion possibly be the old spot for a fan leaf?
Here are my pics.