My horse has always had dry skin behind his knee, resulting in scabs coming off and me sitting for hours trying to get it out of his feathers.
Just recently (the past month or two) the scabs have spread down the back of his forelegs, in his feathers. They started as lumps about an inch long and roughly a centimetre high, in lines all the way down. They then turned scabby, but the horse remainded sound. Now the scabs are falling off and so is a proportion of his feathers, which is never a good sign. He is 11 and ridden quite long pretty much every day as he is a show horse/eventer.
Any ideas on what it could be?