The brown recluse is extremely rare outside of its range. Spiders don’t seek out mammals, and most necrotizing skin lesions are not caused by spiders.
“most necrotizing skin lesions are not caused by spiders.”
So are you arguing that brown recluse bites can do that?
If so your source of information is incorrect. They can be a nasty nasty bite, fortunately they only inject their venom in about 50% of their bites.