you can purchase piriton
, zeet or atarax syrup in appropriate doses for itching .
For worsening eczema
you should apply flutibact cream locally twice a day.
If in 48 hrs there is no improvement give him cloxacillin
syp or cephalexin
syp in addition to above medicines as super-added bacterial infection is a common cause of eczema flare.
Hoping for a speedy recovery.