No one has posted about cold sores, that I could find.
Some tips:
Live culture yogurt can help control outbreaks.
L-lysine taken internally and topically also can help control and help heal outbreaks.
I get cold sores on my mouth during ovulation and during menstruation. Also, stress can cause cold sores. Being out in the extreme heat or extreme cold also triggers cold sores. Plus, getting sick can weaken your immune system and cause cold sores.
I have found that eating yogurt with live cultures and taking acidophilus pills helps control my outbreaks.
Warning: Do not take L-lysine if you are pregnant. It is an amino acid and it actually causes a barrier in the placenta that prevents other amino acids from getting through! When pregnant, only use L-lysine topically.