Thank you for your query.
It appears that your son had some viral infection and the rash
was due to it. Now he has landed with diarrhoea
. Surely give him ORS
to control dehydration
. Hopefully over the next day or two the diarrhoea should get controlled. In case the diarrhoea persists then it shall be advisable to get his stool examined and consult your doctor.
I hope I have answered your query to your satisfaction.
Wishing your son an early recovery.
Rajiv K Khandelwal