Spots on one tomato leaf?
Hi, I'm very new to this but I am trying to grow tomatoes in pots in the garden for the first time. They have been growing very well and look very healthy but today one of the plants has tiny brown spots on just one of the leaves. I have tried searching the Internet to see what it is but having looked at so many pics I cannot decide which one it might be. Can anyone help tell me what it is and if there is anything I can/need to do!! Thank you!