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.
For these minor, but annoying ailments, sulphurous acid is a good remedy. Mr. Pairman applies the strong solution of the acid on lint covered with oiled silk: if the skin be broken, the acid should be diluted. Sore nipples are to be "soaked well with strong acid for a few times" (Pamphlet: "The Great Sulphur Cure," 13th ed., 1868). Mr. Fergus applies the acid in spray to chilblains, or uses as a wash 3 parts of the solution to 1 of glycerin and 1 of water (Lancet, ii., 1870, p. 769).