you haven't gotten a second cold sore - the herpes virus takes up residence in nerve endings (which is why they hurt so flipping much).
they're triggered - for me, common triggers are stress, caffeine, sunlight, and citrus (if i bite into a peach, it'll set it off).
what i find works - and it sounds hokey but it *really works* - is when i first get that itching tingle, i focus hard on it and keep thinking "i don't have time for this s--t - GO AWAY". if i miss and i bite it (cause it's itching) i'll have to deal with the blisters but even then, the mental exercise thing cuts healing time down to 2-3 days.
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