The main difference between earwax and ear mites: earwax is secreted by the ceruminous glands of the human external auditory canal; ear mites are ear canal parasites of cats and dogs.
The skin of the cartilaginous part of the human external auditory canal has ceruminous glands, which secrete a yellowish, sticky secretion called cerumen, commonly known as earwax. Cerumen dries in the air in a thin sheet, and some cerumen is like sticky grease, commonly known as “greasy ear”. Cerumen protects the skin of the external auditory canal and adheres to foreign objects (dust, insects, etc.), and is usually expelled on its own with the help of chewing, opening the mouth and other exercises.
Ear mites are common ear canal parasites in cats and dogs. Hosts for ear mites include cats, dogs, foxes and minks. Skin in contact with ear mites can experience severe itching and a localized allergic reaction. A reddish-brown or black discharge is produced which consists of ear oil, blood, inflammatory secretions and the ear mite itself. Ear mites are clearly diagnosed by microscopic examination at the vet. Topical medication of the ear canal is usually required.