How clean is your liver, Alexandria? (Beautiful name, by the way.)
A rash is simply toxins being forced up into (and sometimes, hopefully, out of) the skin. Your toxic load will be increased due to "die-off" so perhaps the Humaworm herbs have magnified your condition, albeit temporarily. Have you tried gently rubbing a little coconut oil on your rash, or possibly castor oil?
I am sure that this is just a cleansing reaction and the storm before the calm; the apocalypse before salvation, or something less Biblical perhaps!