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I've found it best to soak and use a drawing salve. No surgery required.
Just soak, pat dry, rub the salve on it, and wrap with vet wrap. Do this 1 to 2x a day. Once the scab falls off, you can gently squeeze the core out. After that apply antibiotic ointment 2x a day, and continue to use...
Have you thought of making a roll out, or slide out brooder under the roosts? You might be able to access the brooder without raising your roosts too much that way.
How much space do you have in your run, and is it so secure from predators, that you have no problem leaving the coop door open to the run?
Putting a covered brooder in my run was priority for me.
I first bought a small prefab for my hens to raise babies, but it wasn't very secure. I...
The best way is to plan ahead; build a brooder house in your run, or next to it, and start them outdoors.
Familiarity doesn't really breed contempt, it breeds indifference.
Indifferent chickens ignore new flock members, rather than picking on them.