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.
Aphthous conditions affecting the mouth and fauces are often treated with borax mixed with honey or dissolved in glycerin; a solution of chloride will also succeed sometimes. Aphthous conditions affecting the vulva, and the very irritating "pruritus pudendi" in either sex, may be much relieved by warm lotions or by paints containing borax. Laycock has spoken well of the use of borax in diphtheria (Medical Times, i., 1858, p. 548), but we have more dependable remedies.