Disease on a maple tree?
My mother-in-law has a 30yo maple tree. We noticed that the leaves have tiny green circular bumps, some are red, all over. They're on most of the leaves, but not on the new growth. The barks on the trunk has been peeling for a while, but I'm not sure if it's a common characteristic of old trees.
Does this sound like a disease? Other than that, the tree seems to be doing well. I can try to take pictures if it helps.