There's none. A raving narcissist, Don Mau , took over Topix scabies. I have found you're lucky to find one or two people who's condition is similar and use personal emails as contact for support and trials of meds.
Narcies love forums and the energy required to navigate around the trolling is more than what it is worth.
What amazes me is that the "Right Fighters" don't set up their own websites. Not enough of an audience I guess.