Welcome to the ehealthforum and I am really glad to help you out. Your concern is regarding the non itchy spots on the abdomen of your son. One of the possibilities for such rashes is pityriasis rosea. The other possibilities are contact dermatitis and viral rashes.
Pityriasis rosea is a common human skin disease which presents as numerous patches of pink or red oval rash. The rash may be accompanied by low-grade headache, fever, nausea and fatigue and itching. Topical and oral steroids are needed. Water, sweat, and soap may cause irritation and should be avoided in the disease.
Topical zinc oxide and calamine lotion are useful for pruritus. You can consult a dermatologist and get these medicines prescribed.
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