The cat has a bunch of hard knots at the root of the hair. This is a sign of cat ringworm. After discovering it, the owner should isolate the cat and take the cat to the pet hospital for examination and treatment. During this period, the cat’s living environment and used items should be kept Clean and disinfect everything to prevent secondary infection, adjust the cat's diet, and give the cat more nutritious food to enhance the cat's body immunity and promote recovery.