question: My 9 year old son suffers from asthma, yesterday he got very bad hives. Doctor said he has pneumonia. Hives went away over night and came back very bad this afternoon and are getting worse as the night is going on. He s on predisone, azithromycin, Benadryl and cetirizine. Doctor said as long as his throats to closing and his hands aren t puffy, wait it out. Are bad hives normal with pneumonia and after having antibiotics and benadryl?