@bill899 I'm not certain about psoriasis, I had a bf many yrars back that had crippling psoriasis, it ran in his family, and they used as you are mentioning certain cremes that loosened the plaques and healed the skin underneath. They told him that it was genetic and that they knew the genes involved. They had him come in for light therapy, and along with the creme they gave him, that seemed to work very well. He got it in his ears, in his eyes, they would puss up and he wore long sleeves, high necks shirts, and pants all year around. I would definitely give the Perrin's a try.
It builds the skin back up. Perrin's also has another ointment that they call Perrin's Blend Ointment for Skin Lesions & Abnormal Skin Growths that you can try.