Hello and welcome to HCM
An itchy rash
could be due to infection or allergy
Since, your doctor has ruled out the possibility of infection, allergy for different agents like environmental allergens, drugs, dander, food item, etc has to be sought out.
You will need to consult your physician, a dermatologist
preferably to clinically examine the child.
If the rash appears to be an allergic one, appropriate test needs to be done.
Allergy with various agents is tested on skin and the offending agent is found out and thus the management is planned.
For symptomatic relief from itching, lactocalamine lotion can be applied.
Thanks and take care
Dr Shailja P Wahal