100% OO, unscented, is best for eczema.
Your customer may be sensitive to detergent-based bars and that may be why your soap is working for him.
I would find coconut oil at 40% to be very drying on my skin. What SF do you use?
Please read this link re - eczema from the forum -
http://www.soapmakingforum.com/f34/need-recipe-34145/
Also from another post by Genny -
Does your family have dry skin? Or do they have eczema? They're different things & are usually treated differently.
If it's just dry skin, then coconut oil used in small amounts in a soap should be fine, just up the superfat of your recipe. Using a lotion or body butter after washing will help as well.
Eczema on the other hand can be signs of allergies or other problems & should be seen by a doctor before trying to use anything to fix it.
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