Mohs Micrographic Surgery

A Mohs Excision

An example of how skin cancer is marked during Mohs surgery.

Credit: DermNet NZ

About Mohs Micrographic Surgery

Mohs micrographic surgery is a specialized surgical technique used to treat certain types of skin cancer, including those on the face, recurrent or aggressive forms, and in individuals with compromised immune systems. Unlike standard excisions, Mohs surgery involves numbing the targeted area with a local anesthetic and removing a disc of skin to examine under a microscope. If any cancer remains, another layer of tissue is selectively removed. Performed in-office, this method ensures the complete eradication of skin cancer while minimizing the removal of healthy tissue. Preferred for sensitive areas such as the eyes, nose, lips, and ears, Mohs surgery boasts a 99% clearance rate after 5 years.

However, Mohs surgery is time-intensive. Patients must typically arrive early, and each layer requires 60-90 minutes for processing. If cancer persists, the process is repeated. After complete removal, closure methods vary, including stitches, skin flaps, or grafts, and are determined based on the individual case. Predicting the closure technique is challenging as the cancer's depth may not be visible from the surface.

Mohs surgery is performed by a specially trained Mohs surgeon, typically a dermatologist with additional training in this specific procedure and reconstructive surgery. If a dermatologist recommends Mohs surgery, patients will be referred to a Mohs surgeon.

Patients referred for Mohs surgery should adhere to the post-surgical instructions provided by the Mohs surgeon, rather than the general instructions on this site.

Patients requiring Mohs surgery will be referred to a surgeon specializing in this procedure.

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