This section is from the book "Materia Medica And Therapeutics Inorganic Substances", by Charles D. F. Phillips. Also available from Amazon: Materia medica and therapeutics.
The diffused forms of this disease may be much relieved by alkaline baths (potash and soda carbonates together, of each 3 oz. in the bath), and thickly accumulated scales may be removed by frictions with soft soap. Oil of cade may be usefully combined with the same remedy (soft soap, rectified spirit, oil of cade, equal parts). Hebra applies to severe cases a daily friction with soft soap for many days, not using a bath during the course, but keeping the patient in blankets. This is, however, a painful process, on account of the great tension of skin induced whenever strong potash applications are made to the general surface.