So in the past when I've gotten the beginning signs of a cold sore, I've applied a layer of pure DMSO that I got from the local Tractor Supply Company in the equestrian section. I use the pure 99% gel form. It's easier to use. Then a layer of Extra Virgin Coconut oil, then another layer of DMSO. I let it soak in for 20 minutes before I dress. Do this three times a day. Make sure the area is clean before application. If I catch the outbreak early, it never turns into a sore and goes away in a couple of days. If I drink lemon water every day, twice a day, morning and bedtime, in addition to a daily application of the DMSO and Coconut oil, then I have thus far been able to prevent the outbreaks altogether. Use fresh Lemons, not the already squeezed lemon you buy in a bottle. Also, try to avoid sugar and alcohol. I personally drink coffee every day on this protocol and still am outbreaks free as long as I maintain the regimen daily.