herpes simplex
"I woke up in the morning with redness at the site and a very slight bump that I could tell would soon form into a blister. I immediately applied Abreva to the site as instructed, and continued re-applying every 40 minutes or so within 3 hours the cold sore erupted into a full blown multi-blister sore. I quickly removed what ever was there and began to apply Zovirax. I have used it before but wanted to give Abreva a try. I WILL THROW AWAY WHATEVER I HAVE BOUGHT AND WILL NEVER USE ABREVA Again. It literally made it 100 times worse."