3yr history maculopapular rash around both hip at flexural area (asis), scaly, puritic, hyperpigment excoriated from chronic scrathcin keeps recurring, help?

Chronic eczema. The hyperpigmentation and excoriation indicate a chronic condition. He needs a steroid oinment and moisturizing of skin. He would be better served however, if you took him to a dermatologist so he could set up a long term program for your child.