How does soap and moisturizer help treat eczema?
Use a mild soap or soap substitute that won't dry your skin. You’ll also want a good moisturizer in cream, lotion, or ointment form. Smooth it on right after a shower or bath, as well as one other time each day.
If you have severe eczema, you may find that it helps to take baths with a small amount of bleach added to the water. That kills bacteria that live on the skin of people with eczema.
From: Eczema (Atopic Dermatitis) Treatment WebMD Medical Reference
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