Dr Fiona O'Reilly Zwald specializes in dermatological surgery including cyst and mole removal, routine skin surgery, melanoma excision, MOHS Micrographic Surgery and advanced reconstruction techniques.

Dr O'Reilly Zwald received Fellowship training in Mohs surgery at Vanderbilt University that enables her to provide unmatched skin cancer services to her patients and deliver the highest quality in patient care and outcomes.


At O’Reilly Comprehensive Dermatology, we educate our patients regarding self examination of their moles and what changes to look out for, especially those that would require further examination by a dermatologist.

We advise our patients, if they notice any changes in a mole (e.g. it becomes larger, changes shape or color, bleeds or itches) or if a new pigmented lesion develops on their body, to please call us. We always try to offer same-day appointments with Dr. O’Reilly Zwald to our concerned patients.

What is Mohs Surgery?

Mohs Surgery is a method of treating skin cancer by removing the cancer tissue in stages, layer by layer, and examining the tissue under the microscope at each stage.

This type of treatment helps the physician determine if the tumor is completely removed after the surgery has been performed. What is clinically visible on the surface of the skin may only be a small representation of the skin cancer that lies beneath the skin surface.

Why Choose a Fellowship-trained Surgeon?

By choosing a Fellowship-trained Mohs surgeon, you can be assured that you receive the highest standard of quality and expertise as well as an optimal outcome.

The American College of Mohs Surgery (ACMS) offers fellowship training programs that are challenging and thorough. ACMS fellows-in-training experience months of extensive, hands-on direction from highly qualified instructors.

What Skin Cancers are Treated with Surgery?

By far the most common type of skin cancer is Basal Cell Carcinoma, BCC. The good news about BCC is that this type of skin cancer does not spread into inner organs and tends not to impact life expectancy. However, if not removed, the BCC will grow locally, so an early diagnosis when removal is easy, is extremely important. Basal cell carcinoma can appear in different shapes or forms, such as skin-colored or pigmented lumps & bumps and ulcerated or bleeding lesions.

Other types of skin cancers include Squamous Cell Carcinoma (SCC) which is the most common type of skin cancer seen in organ transplant patients and those who are immunosuppressed. Squamous cell carcinoma does have a tendency to metastasize and therefore, should be surgically removed either by standard surgical excision or by Mohs surgery, as soon as possible.

The most serious type of skin cancer is Melanoma which can arise from normal skin or in a pre-existing mole. The world-wide incidence of melanoma continues to rise. Fortunately, if a melanoma is caught early, the prognosis in most cases is excellent.

If you have any further questions, don’t hesitate to get in touch.