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 erythematous lupus, and in early stages of the tubercular and markedly strumous forms, strong iodine paint is sometimes useful; equal parts of pure iodine and iodide of potassium, in two parts glycerin, may be used about twice weekly; this excites "substitutive irritation," and exerts some absorptive power, though I have not myself seen curative results from it. The plain tincture of iodine relieves the congested livid condition of the neighboring skin if painted over it. Iodoform deserves a very careful trial (v. p. 86)