Our Peperomia Polybotrya has developed some rust/copper coloured spots and I can't figure out what they are. I've googled intensively over the past few weeks, but I'm coming up empty, so I figured I'd throw the question up here.
The first picture is what the bigger patches look like. The second picture is what it looks like after being scraped away. The rest of the pictures are underneath some of the leaves where smaller patches have popped up.
The plant seems to be growing really well, but does have some bumpy patches on leaves as well as two curled leaves. They are on the inside of the plant though, so I figured they just weren't getting enough light.
The rust spots have been there for about a month now. I kept checking for bugs and found none until yesterday. Rinsed off the leaves and nothing since, however the rust seems to now be spreading. This makes me wonder if it's a fungus of some kind that spread when I washed the leaves... I don't know.
Any help would be HUGELY appreciated!