this calves hair is like a rock were it is matted up it is just on his upper back and forehead... could this be some kinda worms, we have wormed him 2 times but maybe the wormer we used didnt cover what he has i dont know..he just looks bad and if you pull on it it comes off like a scab...he has been running with 5 other calves and there isnt nothing wrong with them if anyone could suggest something it would be greatly appreciated.....