Based on my observation I believe that for HSV-1 lesions to occur (commonly called cold sores) the virus needs ambient temperature to multiple and this temperature is preferably cold. Hence, the easiest way to prevent recurrence would be to wash peri-oral area (area around mouth) with hot water to suppress viral multiplication.
I have enrolled few volunteers who would be washing their faces with hot water for the next few weeks-months.
I would soon update the site with the results.
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Thanks Adi. I liked your post!