Hi I can relate to this and at one point I was so dry and itchy clumps of skin was shedding off. I did get dx with seborrehic dermtitis and started steriod shampoo for that and the skin I used a very mild otc cream. It has gotten better but I still am very dry. I sleep with a humidifier and am trying to increase my omegas. I am not sure if this has to do with rsd the dry or the immune system more sensitive. I know that the pain doc I saw who deals a lot with rsd said one with rsd has more infections and conditions like this.