I got Cold Sore while camping this summer. I have no clue how I got it, could be from sharing cups or from the grass. I felt the tingle on my upper lip while returning home. I went to see the doctor immediately. The doctor recommended acyclovoir cream, but I don't find it very effective. However, the nurse told me to wet a cotton ball with alcohol and rub around the lips for 5 minutes. I didn't have alcohol at home by then, so I used my toner instead, because there are alcohol in my toner. I felt comfortable using toner since I used then after washing my face everyday anyways. I wet the cotton part of bandage with Astringent Toner and stick the bandage on the bump. I repeated this about 3-4 times daily for two days, and my cold sore disappeared! The toner I used is called Garnier Pure - Astringent Toner - Tighten Pores. You can get it almost anywhere.