Herpes Simplex
"this and campho phenique are the best cold sore medicines you can get, or at least for me they work. The catch is I have to apply them immediately  after I feel the uncomfortable tingling, even before it breaks through the skin. If I wait for even a small bump to form before applying it, it will take at least 5-6 days before it starts to disappear. But if I do it immediately, the cold sore won&#039;t form. I&#039;m on day 3 and my cold sore is almost gone. It bumped up very slightly the 2nd day but it wasn&#039;t even noticeable. It didn&#039;t turn red or white or that gross yellow color when it scabs over. Just looked like an incredibly tiny skin toned pimple.  And now it&#039;s smaller and flat and almost completely gone. But tonight it will be none existent "