Black salve/ointment

[DontTreadOnMe]

So, had this dodgie looking thing on my face for a year or so, couldn’t see it but if I scratched it, always there, kinda annoying. Where I come from, skin cancer at my age is very common, very dangerous obviously but, meh, bit lazy, not a fan of doctors and not one to panic
Anyway, a suggestion on good old Facebook, in a discussion suggested -

i use this on my husband all the time. he's from Louisiana so I call it his Voo Doo salve. lol. By any chance is it ichthammol ointment?

It seems so, as I said, havnt come across it here in Australia before
https://www.fda.gov/consumers/consumer-u...many-names

Voodoo it seems

I'm pretty suspicious of claims the FDA makes on things these days.
Those pictures...how can we know the facts on them?

Found some Ichthammol on Amazon, sounds worth a few dollars to add to my pharmacy.