Hi Allison,
Thank you for your query.
The lesions described by you seem to be
urticaria or
hives. I suggest you give your son some
histamine preparation like Phenargan. It will be better if you consult your doctor who shall try to identify the cause of this
allergic reaction.
I hope I have answered your query to your satisfaction.
Wishing your son an early recovery.
Regards,
RKK