Your son almost certainly has a very painful virus ingfection of his mouth called herpes stomatitis.The sores in his mouth will be very painful and he may not be able to eat or drink properly. Children with herpes stomatitis may become dehydrated especially in hot weather if they do not drink enough.This illness can last as long as 10 days and children are often very miserable as long as the sores are present in their mouths.Treatment is available if the illness is severe. It would be a good idea for your son to be seen at a paediatric emergency clinic so that he can be properly examined and to make sure that he is not dehydrated.
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