So stupid me bought three new adult hens from a non reputable person (come to find out). I only seperated from my existing flock for a few days. I found lice on one of the new hens on third day together. I dusted eveyone (under wings and vent areas) thoroughly and changed ALL bedding. I used garden and poultry dust with permethrin. I really douced them alot, when do you repeat. They are all together again, is that okay? I read the permethrin kills on contact. Any responses are GREATLY appreciated....also i found gray scabs on vents/ bottom feathers with no live bugs, what are those?!