Clarissa Yang, MD. Accepting New Patients. Title(s): Dermatologist-in-Chief; Harvey B. Ansell Professor of Dermatology and Chair, Tufts University School of Medicine; Associate Professor, Tufts University School of Medicine Department(s): Dermatology Appt. Phone: 617-636-0156 Fax #: 617-636-9169 Skin cancer, atypical moles, acne, laser and cosmetic surgery.