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 internal use of sulphur for many skin diseases rests on an old tradition, but is not much adopted in modern practice. I have tried it extensively, and although the alkaline sulphurous waters are useful sometimes, and in acne rosacea the calcium sulphide, in 1/4 to 1/2 gr. doses thrice daily, seems to help absorption of the tubercles and abate venous hyperaemia, yet, with these exceptions, I have not seen much advantage. Dr. Cane refers to sixteen cases of acne in which the last-named remedy was useful (Lancet, ii., 1878).