How can I prevent my cat from scratching under its chin excessively?

To prevent your cat from scratching under its chin excessively, you can try using a flea collar or medication to address any underlying skin issues. Additionally, providing your cat with appropriate scratching posts and toys can help redirect its behavior. Regular grooming and keeping your cat's environment clean can also help prevent excessive scratching. If the issue persists, consult with a veterinarian for further advice.