This is a skin type. At present, there is no good way to treat chickenpox, but I can recommend a more traditional treatment to you, which has a certain effect. You might as well try it, such as drinking water with virus spirit, mixing it with oxytetracycline or drinking raw water. Ask people where to buy medicine. When all the chickens start to turn black and bloom, slowly peel off the black scab by hand, and then apply purple liquid medicine. I wish your chicken a speedy recovery.