The purpose of this study is to develop biomarkers to predict what medication is best for each child with atopic dermatitis (eczema). Participants will come in to Lurie Children's Allergy of Dermatology clinic for a skin examination and complete surveys. They will apply Eucrisa medication to their skin for 28 days before returning for a second and final skin examination and complete surveys. During these skin exams, tape will be placed on the skin and removed to collect skin cell samples. Photos will also be taken of the skin where tape was placed. There is an optional blood draw.