Pictures of the footpads would be helpful. It is possible that it is bumblefoot in multiple locations, or possibly articular gout which gives a lumpy appearance to feet and toes. Gout has many possible causes, including genetics, too much protein, too much salt or calcium in the feed, chronic dehydration, and many others. Bumblefoot is a bacterial infection that causes scabs on toe and foot pads, and sometimes in between or on top of feet.