Dry itchy skin

Morning everyone, while awaiting to get an MRI scan for Psoriatic Arthritis and, with its connection to Psoriasis that my mother had quite bad. It’s been lately my skin has become very dry, itchy and flakey. Especially my face, scalp and hands. I’ve been using Oilatum cream and shower wash but, not really helping. Does anyone have any ideas what’s best.

Have a good day all.