Help save my ficus (my favourite houseplant)
Hi, I'd like someone help me to diagnose what's wrong with my ficus. Since I bought it, it's been dropping leaves like crazy.
The first thing I do to new plants is give them a pesticide treatment, which hasn't helped. In my opinion the damage also isn't similar to any pest damage I've seen. After searching online, I thought it might be something fungal, but I'm not sure. Photos are attached. In photo 3 you can see 2 red bumps as well as a sort of white mould. The bumps are definitely not scale, although I have no idea what they actually are.
Thanks in advance for any help!
Extra details: It's living by a south facing window. I don't believe there's any draft from the window right now. I am skeptical that it's getting enough sun, since the new leaves are not really growing. Soil is damp but not overly damp from about an inch down from the top.