Yupo said:Podiatrist here.
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There is also Castellani Paint. I think things like this, Gentian Violet and permanganate are rather aggressive, although they do work. Be careful and be aware of staining if you choose to use these. I can't advise on proper dilutions and treatment schedules.
I'm not even sure that potassium permanganate is easily available in the US as it is here at about any pharmacy. I think the US has gone firmly in the direction of pharmaceuticals and tries to discourage the older, cheaper remedies. Here, PP comes in little dose sized packets or tiny pills that you dissolve in the water. I've never experienced it being "aggressive" except in terms of really smacking the microbes of whatever ilk. We use it for wound cleaning and I cured a toenail fungus with it when the pharmaceuticals hadn't worked after years of application. I've stopped turning to the pharmaceutical creams and such now and pretty much go for the PP automatically.