As the number of available treatments for psoriasis and atopic dermatitis grow, there is a need to find a way to identify which treatment will work best for each person. The goal of this study is to develop a test called a gene expression assay to see if the assay can predict treatment success and/or failure in participants with atopic dermatitis or psoriasis. 

Participants will provide information about their psoriasis or atopic dermatitis, treatments used, and information about how their body responds to the treatments. No changes will be made in the therapy as a result of participating in this study.

There are up to 11 scheduled study visits for this study during a period of 3 years. During these visits, participants may have skiin exams and provide skin samples. A stipend of $50 to cover time and travel is available following each completed visits.