usually lip sores are triggered by herpes simplex virus 1 (HSV1). you would want to get blood work to confirm whether or not it is a cold sore caused by this virus and if so, you would need to do multiple protocols that involve deep immune support with:

• immune modulators (upregulate Th1 immune cells)
• antivirals (NAC, black walnut, clove)
• Homeopathic drainage
• medicinal mushrooms, etc

YOu can eradicate viruses from the body but the longer youve had them the longer it takes because they are hidden within cells and tissues so are more protected from our immune system.