Do Epsom salts really do anything to "pull out" infection and reduce swelling?

I’ve been advised, more than once, to soak something (usually a foot) in Epsom salts to pull out infection and reduce swelling. I do think there is a difference between soaking an owie in plain warm water, and soaking in Epsom salt and plain warm water. The Epsom salts do seem to work…or am I imagining things?