Hi, I'm pretty much still learning a lot from gardening and stuff, but when I started high school, the school gave all freshmen the task of taking care of a plant for all of high school and each semester you'll get rewards like an opportunity to turn in a project a day later or get an automatic A in a test (if it's well kept). There were a lot of plants to chose from that the school provided, I chose an Iresine Herbstii. I've taken good care of it up until now, it's gotten pretty big and recently I adopted another almost dying plant that a classmate basically neglected for 2 semesters before i stepped in and began nurturing it back to health. It's on its way to recovery, I've even named it Paul McCartney! (mine's called John Lennon btw). The other plant is an Alternanthera Bettzickiana if I'm not mistaken. During all these time, the only pest I've had to deal with was a surging in alphids from my Iresine and these things. They are like white spots on the leaves but not entirely white. I've always just assumed they were plague and every time I saw a leaf with it, I pinched it off the plant. The spots have become present on Paul too and my dad can't tell me what this means. The following pictures are of a leaf I pinched off from the front and back. Can anyone help me?