Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
Well, first of all you should proceed for an
allergy test to rule out which or which all medicines are causing
allergic reaction to your son.
Once you know about it, better pen it down and remember never to give it to him again as the reaction can become severe next time.
Whenever he needs antibiotics you should always inform his doctor about the allergies.
For now you should continue giving him
Prednisone and Hydroxizine and see if the symptoms improves.
Also do cool compresses over the body to reduce the
rash and inflammation.
Feed him with more of mothers milk, light food and plenty of water.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. Honey Arora