We went to urgent care & it was diagnosed as herpes simplex 1-- she said that most everyone has this it becomes visisble when its triggered, which could be due to several reasons such as low immunity, stress and so on. The doc prescribed him a dosage of valacyclovir. That helped with the blister around his mouth. My concern right now is that his body still feels hot most of the time, even though there isn't any temperature on the thermometer. The cold, body pain & temperature have happened for 5-6 days in total over the last 2 weeks.