DD is 3.5 and has a cold sore. She's had one once before about a year ago. I have never had one so I don't really know much about them. Is there a treatment I can use to get rid of it quickly? I'll be keeping her home until it dries up as I'm assuming it won't be contagious once it's dry. I'm constantly stuck at home lately thanks to DS getting sick all the time and I'm over it!!!