A circle of hard scabs around a cat’s ears is caused by ear mites produced inside the ear canal. The cat brings the ear mites to the ear during scratching and leaves a hard scab. In this case, the owner should clean the cat’s ears in time. ear. First, buy ear cleaning water, put the ear cleaning water into the cat's ears, clean them carefully from the inside to the outside, and then use a wet wipe to dip the ear cleaning water into the ear cleaning water to clean the ears.