1. Subjects who had topical treatment with corticosteroids within 1 week before randomization

2. Subjects who had systemic treatment with corticosteroids or cyclosporine or other immunosuppressive treatment within 4 weeks before randomization

3. Subjects who had ultraviolet irradiation (including photopheresis) within 4 weeks before screening

4. Subjects who participated in another drug trial within 4 weeks before screening

Safety and Efficacy Study of Q301 in Moderate to Severe Atopic Dermatitis Patients