How's your hen?, I bet it was Lice and not fly strike, right? Fly strike is UGLY! The maggots basically eat your chicken, calves and lambs get it too, it kills. I had lice for the first time this spring, I think because my girls couldn't dust bathe in the Winter or Spring

, -40 degrees this winter and Wet,Wet spring!! I sprayed them with Permethrin (HORSE FLY SPRAY) also comes in a brand Safeguard ( you have to dilute), I dusted them with DE and then a week later, Poultry and garden dust ( I got at
Tractor Supply). Last check was Sunday, no lice or any other critters.