First of all, observe whether there is dandruff, caking and redness in the bald eyebrow area. If there is, it is a skin disease caused by fungus, which is cat ringworm. The owner should take the cat to the pet hospital for treatment, and wear the cat during the period. Put an Elizabethan ring on it to prevent the cat from scratching and infecting other parts. When treating cat ringworm, you should continue to spray medicine, and let the cat bask in the sun more during this period, so that new hair can grow quickly.