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.
In congestive and exudative forms of skin disease much benefit may be obtained from the tincture of iron; thus, severe pruritis may be relieved by it (Lancet, ii., 1874, p. 715). In a case of chronic infiltrated eczema, when tarry preparations had failed, painting with the tincture, and afterwards with collodion, not only cured the intense itching, but also the malady itself, leaving only a dry and brown, but sound skin, and I have seen a case of pityriasis rubra in which the intensely red, dry, and scaly condition was more relieved by the application of this remedy combined with glycerin than by anything else. Lichen agrius is also relieved by it. Devergie drew attention to its value in chronic pustular disorders, such as rupia, ecthyma, and impetigo or pustular eczema (Medical Times, ii., 1860), in which it may be locally applied as well as taken internally. It is a good application for variolous pustules (Medical Times, ii., 1856, p. 498, Ranking, ii., 1866), and has favorably influenced the course of anthrax; a striking case is reported by Dauvergne (Bulletin, 1867).