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.
Mr. Pigeon believes that in sulphur he has found the true remedy for this fever, and he certainly applies it very thoroughly, and appears to have had good success. He anoints the patient twice daily with sulphur ointment, gives 5 gr. of sulphur by the mouth twice daily, and fumigates frequently with sulphur vapor (Lancet, ii., 1876).
Dilute acetic acid is used by some practitioners from the commencement of this fever in all cases. Freely diluted, it certainly makes a grateful refrigerant drink. Where the eruption is more or less suppressed, a teaspoonful of vinegar given in sweetened water every two to four hours for a few doses, is said to cause diaphoresis, and to assist in bringing out the rash: however this may be, sponging the body with hot vinegar and water twice or thrice daily is often useful.
Dr. J. Dougall specially recommends the aromatic glacial acetic acid impregnated with neroli, rosemary, etc. - 1 dr. to the oz. of water is used for sponging, and some is volatilized in the sick room (British Medical Journal, ii., 1879).
There is also evidence as to the value of hydrochloric acid in scarlatina. Osborne records a prolonged experience in its favor (Lancet, ii., 1862), and more recently Egbert (Pennsylvania) has quoted nearly three hundred cases, all treated by a mixture containing this acid with chlorate of potash (Ranking, i., 1873). He gave about 8 min. of acid with 20 gr. of chlorate every two hours to a child of six, and more or less than this according to age. Occasionally Tinct. camph. co. was added to relieve restlessness; no applications were made to the throat, unless sometimes ice externally; only one death occurred. Of course it may be said that fevers tend to get well, and will do so under any treatment, but yet these results deserve careful attention. I myself constantly use hydrochloric acid internally and locally in cases of scarlet fever where there is marked general asthenia with dark ill-developed rash, and tendency to sloughing in the fauces (v. Chlorate of Potash).