Looks like fowl pox. It will go away.
Fowl pox is spread by mosquitoes, if you bring any new chickens into your flock, you may want to try planting some plants that repel mosquitoes that are also okay if the chicken eat them.
Fowl pox is spread by mosquitoes, if you bring any new chickens into your flock, you may want to try planting some plants that repel mosquitoes that are also okay if the chicken eat them.