Abreva
"I was really skeptical about paying so much for a small amount. Usually my cold sores do not get very bad or noticable, however, it did this time. The first day I could feel the tingle, the second day my lip was swollen to where my mouth couldn't close comfortably and blisters had started, by the third day my lip had swelled even bigger and blisters were extremely noticable. And by day four, blisters had popped leaving a dark crusty look, some swelling went down. By the beginning of day four I was ready to pull my hair out. Went to the pharmacy and bought a small tube and began to use it like I use oxygen. Overnight I applied a heavier coat and by day five, the large scab from the blisters fell right off!! Swelling was completely gone!"