Thank you for your query on Healthcare Magic.
Your daughter seems to have food allergy
mostly to chocolates, peanuts, and Milo drink.
I advise you to avoid these items and if there is no rash after stopping, then it is confirmed.
But physical examination of the rash by a doctor is important to know the type of the rash.
Whenever there is a rash you can apply a calamine
lotion externally and if there is itching you can give an oral antihistamine like cetirizine
in prescribed dosage.
And consult your Pediatrician
for further advise.
Hope I have answered your query.