A week ago we took in a broken baby (whom we are affectionately calling Twitch). Among his many issues, his tail was broken at the base and had become necrotic. Half of it fell off a few days ago and we were allowing the rest to fall off naturally, however tonight he began chewing at it and it opened up a large wound. We have given Metacam and cleaned the wound with a 20:1 dilution of Betadine and applied Neosporin. Twitch also has neurological damage and has limited control of his limbs and small seizures. We are worried about further damage. Any advice would be helpful. Attaching pictures.