Eczema

My son is 6 weeks and a week ago I noticed his face was a little bumpy. I thought nothing of it because the doctors said that it was a newborn rash that would go away. Over the weekend his face gotten worse and his back and legs broke out. I took him to the hospital last night and they said he has eczema. What can I do to help clear it up? I don't want to use anything with steroids so anything all natural is what I prefer. I have used breastmilk but it seems to be discoloring his skin.