If your rabbit has an open wound, you must bring the rabbit to a vet for treatment. There is nothing you can do at home to prevent infection. Rabbits have very stretchy skin, and the wound will only get bigger and worse if you don't go to the vet's.
If you can, before you leave for the vet's, do this first aid:
Clean the wound: flush with watered-down liquid Betadine (povidone-iodine, watered down to an ice tea colour), and then flush again with water.
Cover the wound with a non-stick bandage pad, and then secure it with self-adhesive bandage wrap. (But don't touch the open skin to the bandage wrap, because it will stick.)
Then go to the vet's. See the related questions below for more details.
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