@Sierra02 - I agree with you that most commercial bath products are filled with harsh chemicals and it's difficult for people with extremely sensitive skin to locate a mild all natural cleanser.
There are a few oils that I've used in the past that my customers believe helped treat their eczema symptoms. There are several recipes online for making eczema soap and you can use them for the proportions depending on which oil you choose to add to the shea butter.
I generally add jojoba oil, avocado oil and almond or palm oil to my soap base for an all natural moisturizer. I've also heard that goat's milk mixed with coconut oil and jojoba oil work well at treating eczema too.