So the back of all four of my horses hooves/leg (not sure what it's called) is red and the skin seems to be flaking off. It has little white pieces of skin kind of like dandruff. It doesn't seem to irritate her as she doesn't care if I touch it, but I'm wondering if this is something to be concerned about? Someone mentioned it might be sunburn but it seems like such an odd place for sunburn. The flaky skin is also on the bottom half of her legs as well but not pink/red in color. What is this and should I do anything?