S.R.
campho phenique
I don't think I spelled it right, but one or two applications and its gone! Very effective and immediately soothing. Good luck M.!
PS I just read the other responses, and I'm probably the oldest one responding because I never used the abreva- it is probably the new campho phenique. Don't freak out- just try the stuff for a day or two and it will be gone. Those others readings might scare you, but my children are 19 and 21 and I never brought them to a dr for a cold sore. Relax!!!!!!!!