Hello, I have a rooster that has many feathers broken off and bald spots all over him. We were treating my whole flock for lice with DE and poultry dust. We now see no signs of lice or eggs. We have also put him on feather fixer for a few weeks and his feathers are still not growing back. In some of the areas where he is bald his skin looks very red and irritated. We have another rooster living with him and the rooster has his feathers all grown back and seems to be okay. Does he still have lice?