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At first I thought of a disease called Rust and as the name suggests, it is orange/red colour but normally a powdery coating and it is much more evident that what you show,
Looking at some of the spots on the foliage it looks like a little bug that either sucks the foliage OR makes a tiny hole in the foliage and lays an egg and the resulting red mark is the grub laid between layers of leaf foliage, it then eats away the leaf.
IF you can, remove one of the damaged leaves, take it over a sheet of kitchen paper and try either cut through a red dot or use a really sharp knife the lift the scale out and separate it to see what's held within the little red circle. that may give you a better clue as to what you are trying to rid the plant with.
There will be lot's of sprays or whatever that can help but, if you dont know what exactly it is then you could buy several sprays and still have a problem.
It may be that at the end of the day all you need do is remove the damaged foliage and burn it or just leave it alone as there is no REAL problem but until you know by elimination you cant try anything.
Hope this is helpful. Best regards. WeeNel.
I tried cutting into the spots and could not tell what they were. I took some addition views of the underside. Maybe that will help with the id. It has spread to a large number of leaves.
Thanks. I have had this plant for 2 years and have successfully fought off aphids. This year it really got big. These spots were a real surprise because they popped up so fast. I will add these links to my plant database.