My barred rock, Gloria, has had a scab on her foot. I believe it is a old wound that never healed... but what do you all think? Can I buy a medicine to put on it? A year ago, her foot was stepped on by a horse. She limps and often will try to peck off the scab, or hold her foot in the air. It does not smell but will sometimes start bleeding. We have tried to put vaseline on it.... but that didn't do anything. Help?