I also used the Derma Solve oil and it gave me so much relief. I wish I had known about it sooner.

This has happened to me twice and my hair grew back, so don't give up. But you have to get rid of the scales first.

I also get Kenalog (not sure if that's spelled right) injections in my scalp when I have a really bad flare. They are uncomfortable but really really help.

Hi Sonny. I don’t have any answers to your questions☹️ Sorry to see your worried about your scalp and maybe your joints. The hair that I lost with bad scalp psoriasis did grow back. I mostly picked at the plaques. When my hair was wet, I was able to gently remove some while my scalp was wet. I also used DermaSmoothe oil (prescription steroid). I got the added benefit of a real cute look in that you apply it, put on a shower cap, and sleep with it on. Alternately, you can apply after a morning shower and wear the shower cap all day. Sounds darling, huh?! It did give good results by kind of melting the plaques.
Have you been diagnosed with Psoriatic Arthritis?

I use T/Sal shampoo from Neutrogena. I put it on my scalp and let it sit in a lather for 20 min then rince. I do this every day till the skin loosens and start to cone off. After i use the shampoo i use Head and Shoulders White Charoal to condition my hair. I hope this info can help you :-)