What Could Numb Arms, Purplish Lips And Heavy Saliva In A Teenager Indicate?

mnumbey grandson is 13 years old and is experiencing numbness in is arms and his lip are looking purplish in color, he also has had heavy saliva and it has happen two days ago and then yesterday and then today about noon and then now again. what could this be and should my son and his wife get him to the er?