Small pimples on your dog’s ears may be caused by bacterial and fungal infection, parasitic infection, tissue hyperplasia, or otitis. If your dog’s ears are itchy, the possibility of infection is relatively high and you need to Clean the dog's ears with ear cleaning solution, and then apply dermatological ointment; if there is no itching, it is best to take the dog to the pet hospital for examination and then carry out targeted treatment.