Skin Cancer Treatment · Surgical Dermatology
Mohs Surgery: The Skin Cancer Treatment With the Highest Cure Rate
Up to 99% cure rate for basal cell carcinoma. 100% margin examination. Outpatient, same-day, performed under local anesthesia. Here's how it works and why it's the gold standard.
Reviewed by Dr. Sam Abaza. Diplomate, American Board of Physician Specialties · MOHS Micrographic Surgery Specialist
6 min read · 7 scientific references
Up to 99%
cure rate for primary basal cell carcinoma. American Academy of Dermatology¹
100%
of the surgical margin examined, vs. under 1% with standard wide excision - Cleveland Clinic²
94–97%
cure rate for recurrent basal cell carcinoma. American Academy of Dermatology¹
95–99%
cure rate for primary squamous cell carcinoma. Cleveland Clinic²
How does Mohs surgery work?
The Mohs process, step by step:
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Tumor visible margin removed.
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A thin layer of tissue containing the visible tumor is excised under local anesthesia.
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Tissue mapped and color-coded.
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The removed tissue is divided into sections, mapped to their exact position on the body, and color-coded for orientation.
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Frozen section processing.
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The tissue is frozen, sliced, and mounted on slides, a process that takes roughly 30-60 minutes per stage.
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100% margin examined under microscope.
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Dr. Abaza examines every edge and the deep margin of every section personally.
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Repeat if needed.
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If cancer cells remain at any point on the map, only that specific location is re-excised, sparing all surrounding healthy tissue. This repeats until margins are completely clear.
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Same-day reconstruction.
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Once margins are clear, the wound is closed or reconstructed, often the same day, by the same surgeon who performed the excision.
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Why does Mohs surgery have a higher cure rate than standard excision?
Mohs surgery has a higher cure rate because it examines the entire surgical margin rather than a small sample of it. Standard excision sends tissue to an outside lab, which typically sections and examines less than 1% of the total margin.² Because Mohs surgeons process and examine 100% of the margin themselves, in real time, cancer cells that would otherwise be missed by sampling are caught and removed before the wound is closed.
A retrospective study of 720 basal cell carcinomas treated with Mohs surgery on the face found 5-year recurrence rates of just 3.2% for primary tumors and 6.7% for recurrent tumors, concluding that Mohs provides the lowest recurrence rates of available treatments, especially for aggressive subtypes and recurrent cases on the face.⁴ A separate British Journal of Dermatology study of over 1,000 facial BCCs confirmed Mohs has the highest 5-year cure rate among BCC treatment options, while noting it's typically reserved for tumors where precision matters most: larger tumors, aggressive histology, and cosmetically or functionally sensitive locations like the nose, ears, eyelids, and lips.⁵
Mohs Surgery vs. Standard Excision
Factor | Mohs Micrographic Surgery | Standard Excision |
|---|---|---|
Margin examined | 100% of the margin, read in real time | Typically under 1% of the margin sampled |
Cure rate, primary BCC | Up to 99% | Lower, varies by margin size and technique |
Cure rate, recurrent BCC | 94-97% | Lower, higher re-treatment rate |
Pathology timing | Same visit, results known before closing | Sent to outside lab, results in days |
Tissue preservation | Maximum, only cancerous tissue removed | Wider predetermined margin removed regardless of actual tumor extent |
Best suited for | Face, ears, nose, eyelids, recurrent tumors, aggressive subtypes | Larger areas of the body with lower cosmetic sensitivity |
Who is a candidate for Mohs surgery?
Mohs surgery is generally recommended for basal cell and squamous cell carcinomas located in cosmetically or functionally sensitive areas, such as the face, ears, nose, eyelids, lips, and hands, where preserving healthy tissue matters most. It's also the preferred approach for recurrent tumors, tumors with aggressive histological subtypes, and tumors larger than 2cm, since these carry a higher risk of incomplete removal with standard excision.⁶
Mohs is most commonly used for basal cell carcinoma and squamous cell carcinoma, the two most common forms of skin cancer, but it's also used for select rarer tumors including certain melanomas, dermatofibrosarcoma protuberans, and Merkel cell carcinoma, among others.²
Dr. Abaza's Recommendation
Sun protection matters most in the months following any skin cancer treatment. The treated area is healing, more sensitive to UV exposure, and patients who've had one skin cancer have a meaningfully higher risk of developing another.⁶ A broad-spectrum SPF is the single most protective daily habit for that risk, both around the surgical site and across all sun-exposed skin.
What should I expect during recovery from Mohs surgery?
Recovery from Mohs surgery is typically fast because the procedure is done under local anesthesia and only removes the tissue necessary to achieve clear margins. Most patients return to normal activities within a few days, with any stitches typically removed within one to two weeks depending on location. Because reconstruction happens the same day by the same surgeon who performed the excision, there's no gap between cancer removal and wound closure.²
Is Mohs surgery painful? Mohs surgery is performed under local anesthesia, so the area being treated is numb throughout the procedure. Most patients report mild discomfort, similar to a dental procedure, rather than significant pain. Some tenderness during recovery is normal and typically managed with over-the-counter pain relief.
Will I have a scar after Mohs surgery? Some scarring is expected after any skin cancer removal, but because Mohs surgery removes the minimum tissue necessary to clear the cancer, scarring is typically smaller than with standard excision. Reconstruction is performed the same day, often by the same surgeon, with cosmetic outcome specifically in mind, especially important for facial procedures.
How long does Mohs surgery take? Mohs surgery can take anywhere from one to several hours in a single visit, depending on how many rounds of tissue removal and examination are needed to achieve clear margins. Each round of processing and microscopic examination takes roughly 30-60 minutes, and most cases require one to three rounds.²
Does insurance cover Mohs surgery? Mohs surgery is a medically necessary cancer treatment and is generally covered by insurance, including most PPO plans, when performed for a confirmed skin cancer diagnosis. Coverage specifics vary by plan, our office can help verify benefits ahead of your procedure.
How do I know if I need Mohs surgery instead of a different treatment? The decision depends on tumor type, size, location, and histology. Mohs is generally recommended for tumors in cosmetically sensitive areas, recurrent tumors, and aggressive subtypes.⁵⁶ A consultation and biopsy are the first steps to determine the right treatment path for your specific case.
Sources Cited in This Page
1. American Academy of Dermatology. Mohs surgery cure rates for basal cell and squamous cell carcinoma.
2. Cleveland Clinic. Mohs Surgery: For Skin Cancer, Procedure, Risks, Recovery.
3. StatPearls / National Center for Biotechnology Information (NCBI). Mohs Micrographic Surgery. NIH Bookshelf.
4. Malhotra R, et al. Mohs' micrographic surgery for treatment of basal cell carcinoma of the face: results of a retrospective study. British Journal of Dermatology.
5. Mosterd K, et al. Mohs micrographic surgery for basal cell carcinoma: evaluation of the indication criteria and predictive factors for extensive subclinical spread. British Journal of Dermatology.
6. National Comprehensive Cancer Network (NCCN) basal cell carcinoma treatment guidelines, as referenced in peer-reviewed surgical algorithm studies (NCBI/PMC).
7. American Academy of Dermatology, Mohs surgery patient guidance.
This page is for general educational purposes and does not replace an in-person medical evaluation. Individual cure rates and treatment recommendations depend on tumor type, size, location, and patient history. Schedule a consultation with Dr. Abaza to discuss your specific case.
Bottom Line
Mohs Surgery Offers the Highest Cure Rate Available for the Most Common Skin Cancers
The case for Mohs surgery comes down to one structural advantage: it's the only treatment that examines 100% of the surgical margin before the wound is closed. That's why it consistently outperforms standard excision on cure rate for basal cell and squamous cell carcinoma, particularly in areas of the body where preserving healthy tissue matters most. For patients diagnosed with BCC or SCC in a cosmetically sensitive area, or with a recurrent or aggressive tumor, it's the treatment specifically designed for that situation.