I have what is probably the original formula on my website. It came from a book published before 1900. The black salve ingredients include bloodroot, zink chloride, flour and water. But the treatment as described uses a second "light" salve in between black salve applications, and applied up until the lesion is completely healed over. It prevents any secondary infection. It uses pitch (bow rosin from a music store), lavender oil, linseed oil, and beeswax. The beeswax is the only questionable product for your case. The formula and product links are on my website http://www.truthquest2.com