Eczema in children

My 4yo just said to me... "I wish I had a different face, arms, and body." I asked him why and he said "because I don't want anymore scabs!". 
This brought me to tears. I've been battling eczema/millia with his skin since he was 2mos old. I had it under control, but the older he gets the worse it gets. He has allergies to EVERYTHING food wise, and he can't be in the sun or extreme heat for long periods of time w/o his skin flaring up. This causes him to scratch and dig at his skin. On several occasions he's scratched his skin off of his back to the point where he needed medical attention. He's been on steroids, creams, & soaps.  
Someone please help me help him... I've tried everything. He's 4 and he's effected by. He should be worried about little kid things not scars . 😢😢😣