So this is my first grow, i have grown 3 from seed, i believe it’s some type of cheese, and 1 of a different strain that a friend gave me that was already matured when he gave it to me. The 3 cheese plants all have had this problem from just a couple of weeks old and are now a couple of months. Other than the obvious marks on the leaves the plants seem very healthy and are growing well. The only thing that makes me think it isn’t spider mites is the fact that it doesn’t seem to get any worse and hasn’t spread to the plant my friend gave me, but i do need to order a jewellers loop and confirm my theory.