Weird raised black legiones on Rhynchostylis roots

[Longroots]

I've seen these black dots slowly spreading across my Rhynchostylis roots recently and I've never seen anything like them. Hydrogen Peroxide 6% seemed to do very little.
Any ideas on what this is?

[estación seca]

I don't know what those are. Do the roots dry between watering? What are your temperatures and humidity?

6% is too concentrated to use on living things. That can definitely cause root damage.

Those spots remind me of insect eggs and fungus.

[Longroots]

It's semi hydroponics, there's not really any root rot though... Also this is 2 days after the application, so no visible damage.