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How to prevent or minimize a cold sore from growing?

I woke up this morning and noticed a cold sore starting to form, right now the bump is very small and barely visible, but I feel the dryness and tingling I always notice at the beginning stage of a cold sore. How can I prevent the cold sore from growing or minimize the size and speed up healing? I'm living in a small town in Spain right now so Abreva will likely be impossible for me to find, are there any other remedies? Thanks!