If a cat has a white patch on its chrysanthemum that looks like an ulcer, it may be an anal gland ulcer. It is best to take the cat to the pet hospital for examination in time to confirm the cause and treat it promptly to avoid delaying the condition. Pay attention to the cat's diet and hygiene, deworm the cat's body regularly, and clean the cat's litter box every day to prevent the cat from being infected with bacteria; do not feed the cat food that is too oily or salty, and feed it some light and easy-to-digest food to avoid Inflammation of the anal glands.