I don't know if this will be helpful, but here goes: I have been through prescription medicine & ointments from 2 dermatologists. On my own, I started using CBD oil on my plaque psoriasis about 1-1/2 years ago. I had very heavy plaque on my feet with deep fissures & my hands had numerous cuts, and my nails had pretty well died. As of today, most of my psoriasis has cleared up. I had to get a prescription for medical cannabis from my GP. Cost right now is $90 Canadian for a 40 ml bottle, although I just found another source at $120 for a 100 ml bottle, which I am going to try. The oil is easily spread and absorbed into the skin. I also find that this oil helps with healing ordinary sores. There are some pictures of my plaque psoriasis here:
http://www.normtoogood.ca/psoriasis.htm
Good luck!