With open wounds that can't be sewn b/c of missing skin, I use sulfur powder (one of the least expensive, longest lasting topical antibiotics you can get - way old school), or something similar like Wonder Dust. Keep chickie warm and away from the others while the scar tissue forms (and it can take a long time, but it sounds like some of these supplements & treatments in this thread might work better than just sulfur). Her behavior and activity level will be your clue to how she's feeling & if she's in pain or not. Young birds tend to heal faster than older ones, for some reason. She'll never have feathers there, but the rest of her feathers will cover it. I had a hen that had her skin sliced off her side under her wing (an area almost as big as my hand) and when it finally healed (and she was NOT a nice hen, either!), you couldn't even tell that her side was naked scar tissue unless you picked her up (which she never allowed). Hopefully your chickie won't be an ingrate like mine was! Good Luck!