I used to have tons of them... I mean TONS of them. I would get one 1 month, it would last for about two weeks, then the next month I would get another.
Now in the past few years I have went from having about 10 a year, to having maybe 1 that lasts for a day. Since I started
vaping again i have had 1 start popping up, but killed it before it had a chance. I have only started vaping a week ago, and my last one was over a year ago, so it might just be a coincidence. Now that being said, I will reveal how I got rid of them plaguing my life. I also made my mother try this (she has allot also, and I suspect she is the one that passed down the virus to me, yet I still love her very much

) and she has had the same results.
I would like to point out that I am not a doctor, and that my solution might not work for you but has worked for tons of people. Got information on how to get rid of them after lurking on forums for several months (It was that bad). Do what you wish with this information, I am in no way encouraging anyone to do this, just giving you info on what helped me. Here is how I did it :
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Electricity anyone? Yep, after lurking on cold sore forums, and seeing what type of devices/cream were coming from cold sore specialists I figured (well people helped me figure it out) that the best solution to cold sores aren't the creams... it's electricity.
Basically, when you electrocute the region where the cold sore is, what you are doing is actually destroying the barrier (outer containment ring) of the virus. And since it no longer has it's external barrier and is weakened the body has no problem getting rid of it. I have seen on some sites(I will try and find a link) that most of the time after electrocuting the cold sore virus, the body doesn't even have to try it fight it since it will most likely just dissipate on it's own.
Now I know this may sound painful, but believe me it isn't. You don't plug yourself on 120v to do this. A 5 volts battery will do the job. Although I personally prefer using something a bit higher (around 8-12 volts) just to be sure it goes away, FAST!
Also take in consideration you are applying this yourself, so as soon as you start feeling some pain or tickling you just stop, wait a few seconds and then start again.
Now they sell these cold sore electrocuting units on the web, but they are expensive. I saw some people taping small electric cables to 5 v batteries. Which seem to be a pain to do, and you also never really know how much juice is left in the battery if it's not a rechargeable one. I myself use a self-made power supply I made when i was in electrical engineering. Now that being said, you can buy a small power supply at just about any electric/home and garden store out there and they sell for like 20$. You plug in two small electric wires, set it at about 5-10 volts and then apply both the negative and positive wire on each side of the infected area for I'd say about 10 seconds at a time, twice a day. Although you might not have the same effect, in my case when doing this the cold sore lasts 1 day or less, and I am getting them less and less frequently. Another fun thing to note is that as soon as I do electrocute one, the burning sensation immediately goes away, leading to touching it less, and not spreading the infection any further.
Like sea said, you could also just take a daily dose of l-lysine, which seems to work for a whole lot of people . But I figure it will probably cost allot more in the long run. Still a nice option to have.