Study of ENV-294 in Healthy Adults and in Adults With Moderate-to-Severe Atopic Dermatitis

The goal of this clinical trial is to learn about the safety and tolerability of ENV-294 in adults with moderate to severe atopic dermatitis. It may also learn about the changes ENV-294 may have on the severity of atopic dermatitis symptoms. The main questions it will answer are: * Is ENV-294 safe and well tolerated in adults with moderate to severe atopic dermatitis? * Is there an impact on the severity of atopic dermatitis symptoms when participants take ENV-294? Researchers will review the atopic dermatitis present at the beginning of the study against the atopic dermatitis present at the end of the study. Participants will: * Take drug ENV-294 once every day for 28 days * Visit the clinic weekly for 4 weeks for checkups and tests * Keep a diary of their symptoms and when they took their study drug ENV-294