How do u get rid of a cold sore?

Once the cold sore has erupted, it will have to run its course. There is only one quick treatment for cold sores, and that is Valtrex, but unless you already have a prescription for it, it won't work well for this cold sore. There is no over-the-counter medication or home remedy that cures cold sores, but Valtrex, which is an anti-viral medication, will make them go away much faster, and as a result of taking this medication you will have far fewer outbreaks of cold sores. It was intended for genital herpes, but cold sores are caused by the same family of viruses, and Valtrex stops colds sores in their tracks. None of the other treatments come close to the effectiveness of Valtrex, not the ointment Zovirax, and certainly not Abreva or anything else. Ask your doctor about it to see if you would be a good candidate for this medication.

These sites are informative.

http://www.webmd.com/skin-problems-and-t…
http://kidshealth.org/kid/ill_injure/ach…
http://www.nlm.nih.gov/medlineplus/ency/…