help!, why do cold sores pop out?

and how are they formed? i had a couple in the last 2 years but now it seems like 1 is starting to form i cant see a red mark yet but i can feel it, its kind of painful and itchy..

how can i stop it before it gets worse...??? because i hate that feeling when i eat something it really makes me uncomfortable.

also i want to know how in the wotld are they formed? i know it has something to do with the body but im unsure of it

little or no acne like bacteria actually create it.
 
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