My friends horse has scrubbed away a large chunk of his mane and has also rubbed the skin off his neck so badly that the area has gone bald and scabby. He has been treated for mites and fleas but hes still itchy, hes on a supplement to try and help (think its global herbs) but anyone have any other ideas as to what it might be? Hes not itchy anywhere else- just the neck area. his owners have since cut his mane short in case this was irritating him but hes still itchy!