I wish I could help you with the beak issue, but I have no idea what the problem there is. I can tell you that all those bumps, scabs, sores look like the dry fowl pox that 7 or 8 of my twelve hens has right now. I am dealing with it a few different ways...I’m continuing to try to keep them calm & cool in this heat so as not too add to their stress levels. I am spraying their combs, wattles, earlobes or any other featherless skin a couple times daily with Vetericyn spray. I am adding RoosterBooster to their water, I usually make sure that’s in their water every other day anyways in this heat. It’s electrolytes, vitamins, probiotics & prebiotics. I am also adding iodine to their water (see attached article screenshot). As far as the Vetericyn goes, I personally avoided the one packaged for poultry and got the bigger, regular strength bottle. They are expensive, the poultry bottle is smaller, it is a weaker strength (0.010% as
opposed to 0.012%), just seems less cost effective...especially since the stronger concentration is still completely safe for your chickens!
P.S: DE is a controversial remedy all around, so just be careful with over exposure to yourself & your chickens. I DO use it on my dirt coop floor, on the ground in their run and I mix a small amount into their dust bathing area. That said, it can do internal damage, respiratory etc. I would just recommend researching it a bit before putting it all over, Willy nilly...