That's the dirty thing in the cat's ear, a small piece of black.

The ear canal of a healthy cat should be dry and pink. If black or brown dirt is found in the cat's ears, it may be excessive accumulation of earwax, or even ear canal diseases, such as ear mites.

If you don't know the condition, you can go to the pet hospital to check and judge the reason. If the cat's ears have suppurated, you must go to the hospital to prevent the illness from seriously affecting the cat's hearing. In general, it is also necessary to use safe and non-irritating pet ear canal care products for cleaning.