What is on my Phal?

[GaviaImmer]

Thanks so much everyone for the help! Luckily the spots haven’t returned in the past 36 hours or so…

But in the process of doing all this though I discovered some root rot. So now I’m wondering if that may have been the cause of the bud blast that originally got me started down this road. They were potted entirely in sphagnum moss that, as I discovered, had gotten incredibly compacted. Removing it was quite tricky.