My dog was bite by a brown recluse once . . . . . It was nasty! So I know what you mean, all of her fur fell out and the wound became about the size of a saucer for a coffee cup, it was awful, those are some nasty spiders.

Reading that made me wonder about spread though . . . . Like people that experience spread after scs or other procedures having to do with the spine. Makes me wonder if it's not really the rsd spreading but this. I'm not really sure it matters much in the end, since they are so similiar . . . . But it would seem with this one any sort of procudures to the spine could make it worse, so if you did have this instead of rsd in your back, and got blocks or epidurals, it could make it worse instead of better.