Ray... Click on "pests and diseases" next to where Dan's post says "Is this Viral?" Find his thread to the right on the pests and diseases page and his file should be right next to his thread. Just click on the paper cliip next to his thread.
I don't know whether or not the ring expands. Only one leaf had this blemish and I didn't discover at an earlier stage. I severed the affected part of the leaf to take the photo, and it has since been discarded.