Lacy Blue, I've had to go through this twice and only twice, thank heaven, so I'm no expert by any stretch of the imagination. But, I'm more than happy to pass along the steps I took, as infection was my biggest fear with both girls.
First, I cleaned the wounds thoroughly with a sterile wash. To that end, I used the "No Hurt" stuff made by Johnson & Johnson. I flush the wound out with that and a syringe without a needle on it. Several times with about 10cc syringe seems to be enough, but you'll have to be the judge on that. If the wound has gotten a lot of dirt in it, you might want to start with just plain distilled water first to get the solid matter out of it, and then follow up with a few rounds of the sterile solution.
Next, I trim away any skin that has been too badly torn up to be of any use. I was lucky in that Cleo's wound was a pretty straight forward laceration. Charlotte took a great deal more effort as the hawk not only ripped her from hock to beyond the hip joint, but had also plowed Charlotte into the ground, thereby forcing all kinds of dirt and debris into the wound. So, a lot of skin needed to be removed from Charlotte.
After trimming away the skin that was too badly damaged to save, I packed the wound site with tribiotic ointment. Neosporin does nicely for this, but it's more expensive than a store brand of tribiotic.
I then stitch the wound with the smallest suture I can find. I've been blessed in having a human doctor who loves my girls almost as much as I do and has kept me supplied with some very nice pre-threaded suture kits. You can also find them online at various veterinary supply places. Look for the smallest ones you can find.
I use sort of a running stitch to bring the two sides of the wound together, leaving a small opening at both the top and bottom ends of the closure. This allows for drainage of the wound as it heals. After I have everything closed up, I use another syringe to pump more tribiotic into the wound at the site of the drain holes. I pump that in, usually from the top opening, until it runs out at the bottom. I DO NOT wrap the wound. It needs to breathe, IMHO. I check the wound several times per day for the first 4 or 5 days, adding more tribiotic as needed as well as applying some to the surface of the skin. This helps to keep the wound site supple, which will help the chicken to heal more comfortably as well as discourages infection.
Hope that all helps you out the next time [and you know there will always be a next time] you have to deal with it.
Thanks for the tip on the blueberries. I just happen to have some in the freezer. I'll definitely give that a try ASAP!!