I deloused the flock yesterday as most chickens were crawling with them This morning I checked one of the most infested birds and didn't see any moving critters (although it was a quick check), her vent is red and irritated - could this be caused by the chemical powder we puffed on her? She also has about a dozen feathers that have big clusters of nits (eggs) on them, close to the skin. Should I trim these off with scissors to avoid the eggs hatching and her getting lice all over again? If yes should I do this for the whole flock? thank you!