Although these have generally been known to clear up on their within 7 to 10 days, studies have shown that treatment with a water based zinc solution (of 0.025 zinc sulfate in camphorated water) applied shortly after tingling starts, should help to speed recovery.
Phenol;
Any over the counter product (see vitamins, etc.) that contains this numbing agent (Phenol) should do for the treatment of cold sores.
Please remember that (in case one were using other prescription medications) it's always a good thing to first consult with a healthcare practitioner (or doctor) before starting any new treatment (either naturopathic or homeopathic doctor, best).
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