The flexural area of elbow and kneees- is the most common site for atopic dermatitis
Atopic Dermatitis is quite common in kids and its an allergy
that affects the skin.
General dryness of the skin and itching are seen in this. Rashes can happen on the face and any where else. But they are really itchy! It is treated with emolients and mild steroids
usually happens on the elbow and knees. In those areas they are usually scaly. But it might happen in flexural areas, and they are not scaly in such cases.
Both can run in families.
Have the lesions examined by a Pediatrician/ Dermatologist
Hope my answer helps you.