You can start by taking a paper plate and cutting a hole in the center from a slit down the side. (if you get that) You need to make sure the hole is big enough for the kitties neck and place it around it, like a funny round collar. tape the slit and this should prevent your kitty from irritating the cut further. Call your vet and perhaps they can just perscribe you this jelly like stuff to put on the chin to aid healing... Kind of like neosporin for humans.. the most important thing is to keep your cat from scrathing it and infecting the spot.. consult a vet for some medicine.:cool:
Hope this helps!