Hello my son is 8 and came home from school on Tuesday with hives all over his torso. I took him to pharmisit and they said to use piriton which I did, the hives disappeared then in morning he woke up absolutely covered in hives I've since been to Drs and they've prescribed prednisolone but were on day 2 of a 4 day course and the hives still there and getting more. Should I go back to Dr?? A+e please help