Dr. Duffy's clinical interests include Mohs surgery (a microscopic technique that allows skin cancers to be removed with very narrow surgical margins), facial reconstruction post-Mohs surgery, and diagnostic dermatopathology (the study of skin diseases at the microscopic level). He is board certified in Dermatology and Dermatopathology. He is also a Fellow of the American Academy of Dermatology, the American College of Mohs Surgery and Cutaneous Oncology, and the American Society of Dermatopathology. His research interests include non-melanoma skin cancers (basal cell carcinoma and squamous cell carcinoma), melanoma, treatment of rare skin cancers, and wound healing.