Many of my hens have lice around the vent. I want to treat them this weekend. I would like something safe for all ages (I have some in the last steps of feathering out). I also think drops--internal or external would be easier than bathing or dusting. Should I deworm at the same time or is that too stressful? I haven't seen worms or the foamy worm poo, but if I will have a withdraw period when I can't use the eggs anyway and it's safe for them, I might as well, right?