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Your son might be suffering from Atopic dermatitis
. It could also be insect bite allergy
as you described it as spots. Site of the rash and whether or not it is itchy was an additional history which could help. Atopic eczema
is associated with red itchy rash usually over limbs,face, neck(mostly over skin folds). Atopic individuals have sensitive skin which will develop eczema due to a lot of external and internal triggers. The triggers might be dust, extreme heat or cold, certain food stuffs, woolen clothes etc. The barrier function of the skin is not normal. 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 under supervision of dermatologist
and it is not over the counter medication
. Topical steroid cream might be indicated to bring the eczema down if it is severe.
Hope this helped