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.
Some dark coloration and much irritation of the skin may occur from the internal use of sulphur. I have seen a red papular eruption from it, and also occasionally boils and carbuncles. The waters of Harrogate, Bareges, Aix-la-Chapelle, etc., have been known to produce such effects.