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.
Erasmus Wilson recommends nitric acid for the treatment of callosities, the cauterized portion being removed occasionally by the knife. I have used nitric acid extensively for the removal of moles on the face; the cicatrices are hardly visible.
 
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