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.
When the eruption is passing into the pustular stage, and when secondary fever is setting in, I can recommend 1/2-gr. doses of hy-drarg. c. creta every three to four hours, for a few days. Unless the gums show signs of tenderness, this treatment tends to check and limit suppuration, and consequently to lessen in some degree the chances of pitting. The local use of mercurial ointment has been already mentioned (v. p. 207).