Sounds like ear mite to me. Suppose they need Frontline spray (not spot on) if that's the case as there is no way to attack them directly. Three squirts per kg bodyweight, which is half the minimum cat (or was it dog? the smallest anyway) dose -that's the rate we applied it, without any problems. Can't be re-applied for 28 days and our vet suggested an egg withdrawral of 7 days.