Potato is well known for its drawing properties. The poultice formula I have heard of for recluse bites has Plantain (not the kind that makes banana type fruit) used for its drawing properties and it has enzymes that neutralize the venom. Earlier I said activated charcoal was part of it but I looked up the formula and it is steamed bituminous coal powder. That soaks up the exudate from the wound and neutralizes the bacteria. It also has Comfrey to stimulate cell proliferation, Echinacea to stimulate immune response and Lobelia which I can’t think offhand the purpose of.
The poultice is a hand-me-down. Somewhere I have an old book with notes my grandmother wrote of various medicinal remedies. I recall her once saying she used a “root-poultice” when my grandfather was injured on the farm. Stopped bleeding/prevent infection. Old timers had no choice. Far away from med facilities. Guess it worked. My grandfather survived the incident...