Neosporin it and vet wrap. Soak it some each day. Try to keep poo and shavings out. I see bag balm talked alot on here but have no experiance with it. With my blister i put a little hole in and squeezed it out so she still had outter skin on. I was able to take vet wrap off in like 5 days. You may want to let it fan or air dry after soaking try and let a scab or outer layer of skin to start forming some.
With how it looks i would think of it as your skin missing a few layers just enough to dot bleed and make white blood cells show up.
Just remember to use the Neosporin without pain meds. I believe that is toxin to chickens...on a side note coconut wine with a great friend is the best...I finished the bottle! Salute!