Here is an interesting article that suggests that barrier creams like Chimal Skin Shield may help with skin conditions like Atopic Dermatitis / Eczema:
Genetic Finding Suggests Alternative Treatment Strategy for Common, Complex Skin Disorders and Asthma
Ineffective Skin Barrier May Trigger Immune Reaction, Illness - released by National Institutes of Health / April 25, 2006

Chimal Skin Shield provides an invisible, non-toxic, non-greasy skin barrier cream / barrier lotion that provides unequaled protection for any and all skin areas. We have combined a silicone compound with humectants (for moisturizing dry chapped skin) to form an invisible, non-obtrusive barrier that seals in moisture while it seals out caustic and toxic elements.