I get the cold sores, cracks in sides of mouth, and
tongue ulcers as well. As SOON AS I FEEL THEM COMING ON, I immediately take 1,000 mg of Lysine (500mg in the morning, 500mg at night). I starts to thwart them off by the next day. It is truly amazing. (Get the GOOD kind at a place like the Vitamin store or a reputable health food store - - - make sure it has NO yeast in it!)
There seem to be certain foods / chemicals in the food that instigate mine. Keep a food diary!