Human: Is there anything I can do to prevent a cold sore from appearing on my lips? Assistant: 
Yes, there are things you can do to help prevent a cold sore from appearing on your lips. One way is to keep your lips clean and moisturized by using lip balm or petroleum jelly. You should also avoid touching your mouth with unwashed hands, as germs could transfer from your fingers to the area around your lips. Additionally, it's important to practice good oral hygiene such as flossing and brushing regularly to remove food particles that may be contributing to the development of cold sores.