Cats have fleas, lice, ticks and mites. If the cat is not bathed and dewormed regularly and the cat often goes out to play, the cat is easily infected with these external parasites. After cats are infected with ectoparasites, they will generally experience skin itching, hair loss, redness, swelling, scabs, cat moss, dermatitis, etc. If it is ear mites, there will be dark brown secretions in the ear canal accompanied by a foul odor, so it is necessary to Do a good job in prevention. Once your cat is found to be infected with external parasites, it must be treated promptly.