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 pediculi infest the head or the clothing, ointments containing the red oxide, or the ammonio-chloride (white precipitate), will often suffice to cure, and have the advantage of being free from unpleasant color or odor: mercurial fumigations may sometimes be required for the body. For the pediculus pubis, blue ointment is commonly prescribed, but it is not a pleasant application, and I have seen it produce much irritation. As in all cases when the hair is affected, destruction of the eggs or "nits," which are closely attached to the hair, is important for cure, and, for this purpose, weak lotions of sublimate are good (2 to 3 gr. to 1 pint water), or strong lotions of vinegar, followed by the use of a dusting powder or ointment containing calomel or white precipitate.