Hi, Just came home from be out all weekend, and found one of my 6 wk chicks huddled in the pen. Picked her up and it looks like her skin is cracking/peeling/rotting off all over her body. Very gross. No discharge from eyes/nose, still drinking for sure, but dont know about eating. Definitely lethargic. The skin between her toes is cracked so bad its bleeding, also up in the creases of her wings. She does have a little poo around her vent, but otherwise I don't know how her poos are. She has been eating medicated chick food, but is free ranging during the day and could have access to the layer food. Could this be mareks? I am thinking to cull her but need to know what to do to protect the rest of the flock.