Duncan Dermatology 1104 Adams St. # 201 St. Helena, CA 94574 (707) 967-0800 (phone) (707) 967-0870 (fax) (707) 967-0800 (text) Hours: Mon – Fri: 9am – 5pm @DuncanDermatology To Schedule An Appointment Book An Appointment, call or text (707) 967-0800, or email us at [email protected].