If the cat does not have ringworm, but there are white flakes on the fur, it may be caused by dry skin, or it may be fungal infection or parasitic infection. You should observe whether the cat has skin itching. If there is itching, the cat needs to be treated. Use drugs to treat fungi. If there is no itching, you can give your cat lecithin, cod liver oil, broccoli, carrots and other foods.