herpes simplex
"I used to swear by this stuff... until today! I woke up this morning and thought I was beginning to feel it. I immediately went to the bathroom and put some on just in case. I reapplied a few times after realising it was definately a cold sore coming on. I usually can use it and they never fully develop. Not this time... this thing has exploded in blisters all over the right side of my top lip and this is the most painful one I ever remember having. Every time I reapply takes the pain away for a short time but then it's back with a vengeance!! I'm not sure if because my lips were kind of chapped maybe it was able to take off or its a real aggressive one this time or my body is used to abreva and its lost its super power?"