I started taking birth control 6 months ago. Immediately, in the first month of use, I got my first cold sore in two years. Two months later, I felt a tingling as if a cold sore was coming on. I bought Viroxyn, a one-time cold sore treatment. I put on the Viroxyn as soon as I felt the tingling, and the cold sore never showed up.
Since then I have felt about four more cold sores coming on. Each time I feel the tingling, I immediately apply a dose or two of Viroxyn, which seems to keep the cold sores at bay. However, if I keep using the Viroxyn so frequently, will my body eventually become immune/desensitized to the medicine?