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.
Baudon found immediate good results from painting the vesicles of herpes with tinct. ferri perchlor, and glycerin; he recommended opening the larger vesicles for the application, but Gressy obtained equally good results without opening them, using a concentrated alcoholic solution, which gave rapid relief (Bulletin, t. lxiii.). An ointment containing 6 to 10 gr. of sulphate of iron in the ounce is recommended by Palmer (Medical Times, ii., 1861, p. 24).