Dark green blisters on outdoor photo

Just in genetics deformity it be ok one out every 10-20 seed are like that . Looks good tho

It looks like chemical burns; u sure you haven't managed to pour nutrient water on the leaves, when watering the plant? 😂

The weird leaf mutation is nothing to worry about, various leaf mutations are quite common with cannabis plants and are not a sign of any sort of disease or deficiency, just a weird leaf, pure and simple. It will not affect growth, yield or potency. The bubble/blistered leaves can occur when one leaf lies on top of another leaf, which causes "sweating". This "sweat" (water really) then heats up and cooks the leaf underneath, causing the bubble/blister affect. Again, quite common on bushy plants and not a symptom of disease or deficiency, just a "cooked" leaf that has separated the upper and lower layers of the leaves in question. Leaves are like a 3 layer laminate and this cooking has caused the laminations to lose their bond, causing the bubbling/blistering effect. Again, this will not affect growth, yield or potency, it is purely cosmetic damage. Hope this helps, Organoman.

Looks like you have a mild pest issue. You can use a extremely mild 3 percent hydrogen peroxide and water mix on leaves. Please research the amount I do not know it off hand. Or neem oil. Neem oil will make plant taste bad if in budding. Apply any solution at start of night hours so moisture and sunlight don't burn leaves. Good luck

The only thing I could find was broad mite damage but that's just a guess. I seen a few similar looking pictures on growweedeasy.com Lots of great information there if you can't get it here. Good luck and atleast the damage is very minimal