Whats the best treatment for exzema?

Steroids. The mainstay of treatment is occasional use of topical steroids (kenalog/triamcinolone for example) and good moisturizing. Avoiding products with alcohol or harsh detergents can also be helpful. Your doctor should be able to give you suggestions, but i often recommend dove moisturizing bar to wash with, all clear for laundry, and cerave for a moisturizer.