well, I mean, that when you make the oil, you are actually making a sort of tincture which you can refrigerate in a bottle and keep for a long time. fresh garlic, cut, grated, etc. must be used immediately and shortly thereafter begins to dry from my experience. Actually, I don't know if they even recommend refrigerating the garlic tincture, but I do. :)
What I used to do with fresh garlic is simply cut a clove in 1/2 or 1/4 and then mince just the end of it, by only a centimeter or so with a really thin knife blade. This makes the 'flat' end a bit cut up, wet, etc. Then I would put this directly on the lesions. It works pretty good and yes DEFINITELY HURTS! But regarding garlic, no pain no gain regarding herpes! And I would replace it after a few hours once it started to dry out.