My almost 5 month old filly had this rash appear on her cannon bone.. We noticed it the weekend of September 25th, but at that time it was just flat rough spot. I started spraying Vetricyn on it, but honestly haven't been that good about doing it every day because I though it was just some temporary rash that would disappear on it's own. Well as of today it did not, not only that it's not just a rash but it progressed into a hard "bump" that is hard to touch and it looks like it's going to crack and split any day now..
I have no idea how she came about this, poor little baby.. I keep both my horses very clean, they get daily grooming and attention, I don't let them stay out in the rain, they are out all day, then they have a nice stall to rest at night.
I have attached some pictures, does anybody have any idea what this it and how I should treat it? Any advise is appreciated.