I got my pilea 2-3 months ago and it's been doing very well, until couple of days ago when I noticed some black spots on the leaves. The spots got bigger today and I don't know what is wrong. Attached images from yesterday and from today. Although I bought it 2-3 months ago, I've re potted it only recently into a terracotta pot with hole at the bottom. Originally it was in a plastic one. I live in a warm country so the cold it's not an issue. Apart of the re potting I might have put some oil on the leaves to make them more shiny / I realize now, that this was a mistake/, but could it be the reason for the spots? I water it on an average once a week and I keep it in a relatively bright room, I moved it closer to the window 2 days ago, in case this is a light issue. However no direct light at all. It also has 3 babies, one is already re potted in a new pot and 3 new ones just came out recently. Also, not all the leaves got these spots, only the older ones, or may the ones where I put the oil, I think. The new leaves don't have any. What should I do? Also, should I cut the problematic ones?