Ben has some sores on his heels. They are small and circular and look a little scabby. He also has been stamping his feet and they are obviously itchy. He has got a fair amount of feather and I know that mites are common in heavy horses. Someone on the yard said they were just bites and will go away on his own but I'm not sure. I have got the Yard Manager looking at him tomorrow for me, but has anyone got any advice? He has got 2 sores on one leg and one on the other.