One of my chickens appears to have lost a toenail. we noticed her limping a couple of days ago and sprayed with purple spray. Today the foot was still sore (she was standing on one leg) and gave the foot a wash in warm water to remove all the loose mud etc. She was tender in the area and the brown areas felt softish. I sprayed with Savlon dry antiseptic which is a sort of iodine. Any other suggestions for how to treat it?