[Loudoun Dermatology Associates – Dermatological Care for All Ages in Loudoun County Established in 1997, Loudoun Dermatology Associates is dedicated to providing the very best in dermatological care for all ages. Dr. Ha and his staff have extensive experience in the diagnosis and treatments of skin cancer, acne, psoriasis, eczema, hair and nail issues, infections, cysts, and cutaneous autoimmune diseases. We provide both general and surgical care.]