Hello, Welcome to healthcare magic. From your history and description, your son may be having mild atopic eczema. It is a type of eczema which usually runs in families and could be associated with nasal allergies and wheezing. The child will have dry skin along with itchy eczematous rashes on and off. A moisturizing lotion is a must on a daily basis and reapply it 2-3 times according to the dryness. It helps to restore barrier function. Use very mild cleanser for bath like cetaphil sensitive cleanser. Give him an antihistamine at night like cetrizine or hydroxyzine if it is itchy. Topical steroids should be used on the itchy rashes under supervision of dermatologist. Do consult a dermatologist if the rashes are not coming under control with moisturizer and antihistamines alone. Hope this helped. Take care.