If it is foot and mouth disease the only thing you can do is to treat the symptoms. Our pediatrician gave us the recipe to a little cocktail of medicines that temporarily numb the mouth and throat so that you child will bea able to eat without pain. It is 1/2 a tsp of Maalox (the regular adult kind) and 1/4 tsp of Benadryl. My son did not seem to mind it. The sores will go away on thier own since it is a virus. Good luck.