Urea doesn't work for everyone
I would use urea based creams, scrub my skin everyday and the only thing it did was irritate my skin. The scales were still very dark and never went away with soaking and scrubbing. The ichthyosis I have is the type that is not very dry but under the skin and extremely visible. I went to the doctor and they gave me a moisturizing cream with ceramides as base and it has worked wonders. Throughout my life, people have told me to put urea creams and scrub.
All I'm saying is if you're doing the same and the only thing it's doing is hurting you, then stop. Go to a specialist and find out the type of ichthyosis you have and work out a treatment plan. Don't listen to people who don't even know what ichthyosis is. I have seen someone on this sub with a different type of ichthyosis use urea creams and their skin has become so much better and I expected the same but it didn't work. Just because it works for them, doesn't mean it might work for you too. Don't think you're not putting enough urea or not scrubbing enough because it's not working, it just might not be because you have a different type. Don't hurt yourself like me.