Remedies for Eczema in Babies, Toddlers, and Children

My son who is 7 years old is been suffering from mild eczema since he was a baby. Recently, about three months ago, his condition has taken the worst turn. His ecaema started to get worse. I recently bought a book on line which says to give him apple and carrot juice. I give him a glass a day and his eczema spread on his stomach, thights, arms, back, and side of his face. I don't know if this is related to the juice or not. I would like to give him ACV and know what amount. Thanks in advance for help.