herpes simplex
"At first when I was reading  these reviews I thought they were a bit excessive and was sure the company was paying people to write positive reviews. But after my experience I now can see they true. It was the first morning of my 3 week vacation in LA and I woke up with a cold sore. Awesome. It already was at its blister stage and so swollen and painful (top left side of lip). I got the abreva pump from cvs and spent a whole day continuously reapplying. It completely reduced the swelling and blister and now its completely shrunk and about to disappear and its day 2. Usually I get cold sores once or twice a year that last 10-14 days. I cannot believe this actually worked.  definitely worth the $22"