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Many folks eat high lysine foods prior to or during a cold sore event, and avoid high arginine foods. For many folks, healing cold sores fast has been as simple as taking 1,000 milligrams to 3,000 milligrams of lysine in capsule supplements during an outbreak. High lysine foods to eat are most meats and dairy products.
Any topical treatment for cold sores from the pharmacy will help it go away faster. Also, you should take L-lysine tablets (available at health food stores) as soon as you feel one coming on. Since I've discovered this, I have not had any more fever blisters and this was about 3 years ago.