Itchy rash for 2+ months. It’s on back, stomach, arms, armpits, legs…scabies?

My 2.5 year old son has had a worsening itchy rash for 2+ months. It’s on his back, stomach, arms, armpits, legs. Pretty much everywhere except his face, soles of his feet and palms of his hands. One dr said heat rash and the other is now treating him for scabies and it hasn’t improved yet with that treatment (going on 48hours) and has new ones since then. No one else in our house has any kind of rash so I don’t think it’s scabies. Any other ideas on what it may be or what could be causing it. I have changed laundry soap, stopped using dryer sheets, washed everything I can think of, no lotions etc. could food allergy cause this? HELP


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