Thank you for your query on Healthcare Magic.
is looking like some allergic skin reaction mostly due to some allergen.
In rash associated with viral illnesses, there may be a history of preceded or associated fever
Try to find out any allergic factor like any new food item, clothing, or any dust.
You can apply a calamine
lotion for external application over the rash for soothing effect.
If there is more itching, an oral antihistamine like hydroxyzine
can be given in prescribed dose.
Hence consult the doctor for physical examination and treatment.
Hope I have answered your query.