At first tingle hold an ice cube on the spot until frozen, then use Zovirax, available on prescription or over the counter. Found this to be the most effective cold sore cream and believe me I have tried them all.
Whoa !! I know the problem. Any cold sore cream that has Acyclovir in it's make up will do the trick. Apply at least 5 times a day from when you get the first "tingle". Zovirax is expensive but Tesco now do their own which is a lot cheaper. Good luck
FBG40
At first tingle and continued application vigorously rub some aftershave or perfume into the area. In addition to Zovirax. Won’t get rid of it but reduces the infection time.