It could be ear mites. \x0d\ Ear mites are a common problem for cats. Most cats have had it before, but as long as they keep wiping them, they can be cured in about two weeks. If you consolidate them from time to time in the future, there will be no more problems. \x0d\If possible, you can ask the doctor to wash it first, because when the doctor washes it, he may also wash the depths of his ear canal, and you may not be able to do it yourself:) Then you must learn to wash your breasts by yourself. It's gentler and easier for Mimi to accept. You must learn to wash yourself. This is the most basic daily care for your breasts, but you can’t be lazy! \x0d\Find a place with good lighting and turn the ears over (button them on the head). See if there is more reddish-brown stuff in the ear canal? Use a cotton swab to probe inside and see if there is more reddish-brown liquid stuck to the cotton swab? Are there any dark reddish-brown scab-like patches? Twist it with your hands. Those small pieces will not be easily twisted evenly (if it is mud, it will be easily twisted). \x0d\Get a magnifying glass (just for reading newspapers) and carefully observe the reddish-brown areas in the cat's ears. If there are small reddish-brown aphid-like insects crawling around, that is ear mites. \x0d\In addition to cleaning the ear canal, ear cleaning solution can also reduce inflammation and prevent/treat otitis media caused by ear mites. Ear oil is insecticidal but poisonous, so be careful not to let your cat lick it. \x0d\·Black mud and ear mites\x0d\First of all: the colors are different. Ear mites are dark brown, and if you look closely you can see brown or light brown ear mites (with a magnifying glass). \x0d\Secondly: the properties of dirt are different. Cats with ear mites secrete a lot of oil-like brown fluid from their ears. Ear mite wax appears in irregular sheets and sticks to the cat's ears. If it is mud, firstly, the distribution should be even, not lumpy. Second: There should not be a large amount of brown liquid secretion. \x0d\Third: The touch is different. (If you like) Take a small piece of earwax and twist it with your fingers. The mud will be easily smoothed and feels delicate. Ear mite wax feels rough and difficult to twist open. \x0d\Experience in treating ear mites in cats\x0d\It is best to go to a pet hospital to buy a complete set of ear mite medicine, including ear mite oil and ear cleaning solution (you can’t just use one kind!). It would be better if you can ask a doctor to help you clean your cat's ears thoroughly. \x0d\Ear mites are very annoying and easy to recur, so you need to be patient. \x0d\1. Use a sterilized cotton swab dipped in medical hydrogen peroxide to wipe the internal and external auditory canals (it is better to have someone assist you)\x0d\2. Wipe until there is basically no color of secretions, and let dry slightly. \x0d\3. Instill 2-3 drops of nitroglycerin ear drops, cover the ears and rub gently. After letting go, the baby will shake his head to throw out the dirty things. \x0d\4. Wipe the dirty things with paper towels and apply Dermatitis Plate all over. \x0d\Special tips: 1. Before treatment, be sure to test whether the cat has ear mites. There is a fungus that can also grow in the ear canal, and the dirt it produces appears to be almost the same as ear mites. Symptomatic treatment is effective only after diagnosis. \x0d\2. Ear mites are parasites that can be transmitted between cats living together. During treatment, pay special attention to whether other cats in the home are also infected with ear mites. For families with conditions, isolation treatment is recommended. \x0d\3. Ear mites are not contagious to humans. Cat owners don’t have to worry about being infected.