herpes simplex
"I ran out of acyclovir so thought I'd try Abreva since I couldn't get in to see my doctor. Have had cold sores for 20 years and since using Abreva, I have had my worst episode yet. Seems to heal the area, but then the cold sore keeps popping up in new parts of my lips, despite using q-tips and being very careful not to spread it. Have had this for 10 days now and am frustrated. Not sure why this is happening but I'm going back to my doctor to get a prescription for acyclovir cream."