If you notice a bald patch on your cat's ear, be alert for ringworm, which causes itching. Malnourished cats can also experience localized hair loss; in this case, you should supplement their diet with lecithin, trace elements, and other nutrients. If your cat is constantly stressed or anxious, hormonal imbalances can cause localized hair loss; in this case, you can supplement their diet with vitamin B. 
Why cats' ears are losing fur and becoming bald
Be alert if your cat has ringworm. Ringworm causes itching, and frequent scratching can lead to hair loss and bald patches. In this case, you need to isolate the cat immediately to prevent the spread of ringworm, and then treat it with a spray.
Malnutrition can lead to poor hair growth in cats, resulting in localized hair loss. You can feed your cat food or supplements that provide lecithin, vitamins, and trace elements.
A bald patch on a cat's ear can also be caused by hormonal imbalance. Persistent stress and anxiety can easily lead to hormonal imbalance. In this case, you can give your cat an appropriate amount of vitamin B and pay attention to adjusting your cat's mood.
