After researching- it seems my girls have avian pox. Pic below in comments. This is my first flock and I've been thru the ringer with them- we've had cocci issues, sinus infections, predator issues, and now this, not too mention other "unknown causes" of death of other chicks. I just feel defeated. I feel like I've given them every opportunity to live the healthiest lives possible... Is this normal or am I doing something wrong??