In order to prevent cold sores, you need to first know that sores occur often in people who are sick or stressed out. So you want to monitor your stress levels and maintain a healthy approach to life. Worrying about bills, rushing from place to place and feeling depressed all the time are causes of stress. Control the amount of stress that comes into your life and you will control the sores that appear on your lips.
Sometimes, cold sores are also caused by sickness. Since you stay outdoors for too long, find reasons to stay indoors more often. When the weather is very bad, you definitely want to stay within closed doors. You never know what kind of pathogen is transferrable in the air or water.