<s>[INST] Hello, I have two questions I m sure you can answer, 1. Are canker sores or cold sores the contagious ones, and which can contain the herpes virus? 2. Why does the inside of my lips turn a pale color or sometimes almost white when I eat like salt n vinegar chips or something like that? I hope you can answer these, I would love to know, thank you! [/INST] HI, thanks for using Chat Doctor Cold sores are due to the herpes virus. There are different types of herpes viruses, but cold sores are usually associated with the herpes 1 virus though some persons may have sores due to herpes 2. Herpes 1 infections (cold sores) are very common. The change in color of your lips with certain foods may be due to reaction to the active ingredient present. I hope this helps </s>