Is Mohs Surgery Right for Your Melanoma?
Medically reviewed by the medical team at Clearview Dermatology
Key Points
- Mohs surgery is an appropriate treatment for certain melanomas, particularly melanoma in situ and superficial spreading melanoma in cosmetically or functionally sensitive locations.
- The key difference from treating basal or squamous cell carcinoma is the lab process: melanoma requires special immunohistochemical stains, including MART-1, to identify tumor cells clearly under the microscope.
- Wide local excision remains the standard for many invasive melanomas, but Mohs offers a meaningful advantage when preserving tissue on the face, ears, hands, or scalp matters.
- Mohs for melanoma is typically coordinated with oncology, and follow-up involves regular full-body skin exams and dermoscopy surveillance.
- Dr. Joe Overman at Clearview Dermatology is a double board-certified dermatologist and fellowship-trained Mohs surgeon with experience treating melanoma using Mohs micrographic surgery.
When most people hear 'Mohs surgery,' they think of basal cell or squamous cell skin cancers. Those are the most common indications, and the technique was built around them. But melanoma -- the skin cancer that generates the most questions and concern -- is a different conversation.
The short answer is that Mohs surgery is appropriate for some melanomas and not others. Understanding the distinction depends on the type of melanoma, where it is located, and how deep it has grown. For the right candidates, Mohs offers something that standard excision cannot: real-time, complete margin verification before the wound is closed.
Here is what patients at Clearview Dermatology need to know about Mohs for melanoma, including which types qualify, how the lab process works, and what happens after surgery.
Why Mohs Is Not the Default for All Melanomas
To understand when Mohs makes sense for melanoma, it helps to understand why it is not used for every case. The issue is not the surgical technique -- it is the laboratory process.
Standard Mohs surgery relies on frozen tissue sections stained with hematoxylin and eosin, the same stains used in most pathology. For basal and squamous cell carcinomas, these stains work well. The tumor cells are distinctive enough to identify clearly even in frozen tissue prepared quickly between surgical stages.
Melanoma cells are more difficult. In frozen sections stained with routine dyes, melanocytes -- the normal pigment cells in skin -- can look similar enough to melanoma cells that distinguishing them becomes unreliable. A standard frozen H&E section might miss melanoma at the margin or flag normal tissue as tumor. Neither error is acceptable.
The solution is immunohistochemical staining. At Clearview Dermatology, MART-1 (also called Melan-A) staining is used during Mohs for melanoma. MART-1 is a protein expressed by melanocytes and melanoma cells that binds specifically to an antibody marker, making tumor cells visible against the surrounding tissue in a way that routine staining cannot achieve. This additional step is what makes Mohs reliable for melanoma -- and it is also what makes the process more complex and time-intensive than a standard Mohs case.
Which Melanomas May Be Candidates for Mohs
Not every melanoma is a Mohs candidate. The decision depends on the histologic subtype, the depth of invasion, and the location on the body.
Melanoma In Situ
Melanoma in situ, including lentigo maligna, is the most common indication for Mohs in the melanoma category. In situ means the melanoma cells are confined to the epidermis and have not yet invaded deeper tissue. Because there is no dermal invasion and no risk of metastasis at this stage, the treatment priority is complete margin clearance. Mohs is well-suited to this because it checks 100% of the peripheral and deep margins before closure -- a meaningful improvement over standard wide local excision, which samples only a small fraction of the true margin.
Lentigo maligna in particular tends to occur on sun-damaged facial skin in older patients and often has indistinct clinical borders that extend well beyond what is visible to the naked eye. Mohs allows the surgeon to follow the tumor precisely rather than guessing at how wide to go.
Superficial Spreading Melanoma
Superficial spreading melanoma that is thin (generally less than 1 mm Breslow depth) and located in a cosmetically or functionally sensitive area may also be considered for Mohs. The rationale is the same: complete margin verification with tissue conservation. For thicker or deeply invasive melanomas, sentinel lymph node biopsy and wider margins become the clinical priority, and wide local excision with oncology involvement is typically the appropriate path.
Location Matters
The location of the melanoma is often as important as its subtype. Mohs is particularly valuable for melanomas on the face, nose, eyelids, ears, lips, scalp, hands, and feet -- areas where tissue conservation matters both cosmetically and functionally. Removing an extra centimeter of margin from the back of the shoulder carries little consequence. The same margin on the lower eyelid or the tip of the nose requires a different calculation.
Mohs vs. Wide Local Excision for Melanoma
Wide local excision, or WLE, is the standard surgical treatment for most melanomas. It involves removing the tumor along with a margin of normal-appearing skin around it. The margin width is guided by clinical guidelines that vary by tumor thickness: typically 0.5 to 1 cm for in situ melanoma, 1 cm for thin invasive melanoma, and 1 to 2 cm for thicker tumors.
WLE is effective and well-established. The limitation is that the excised tissue is sent to a pathology lab, processed, and reviewed over a period of days. The surgeon closes the wound before margin results return. If margins come back positive, a second surgery is needed.
Mohs addresses this differently. Tissue is processed and reviewed in stages, with the surgeon waiting for margin results before proceeding. If tumor cells are found at a margin, only the specific area with positive margins is re-excised. The process repeats until all margins are clear, then reconstruction is performed in the same appointment. For melanoma in situ, studies have found that Mohs with immunohistochemical staining achieves lower recurrence rates than standard WLE using fixed margins. For invasive melanoma, the evidence is more limited and WLE remains the standard approach for most cases.
The practical difference for the patient is meaningful: one visit to achieve clear margins and complete reconstruction, rather than the uncertainty of waiting for pathology and the possibility of returning for a second procedure.
How the Lab Process Works for Melanoma
Patients who have had a Mohs procedure for a different skin cancer may notice that melanoma cases feel different. The extra time between stages is the most noticeable difference, and it comes from the staining process.
After each layer of tissue is removed, it is processed into frozen sections and stained. For melanoma, the tissue undergoes immunohistochemical staining with MART-1 in addition to standard processing. The MART-1 antibody binds specifically to melanocytic cells, making them identifiable under the microscope against the surrounding dermis. This allows Dr. Overman to map the precise location of any remaining tumor cells before deciding where to take the next stage.
Because this staining process takes longer than routine H&E preparation, each stage of a Mohs melanoma case takes more time. Patients should expect a longer appointment than a standard Mohs case -- typically several hours, depending on how many stages are needed to achieve clear margins. The additional time is the cost of the additional certainty.
Coordinating with Oncology and What Comes After
Melanoma, even at an early stage, involves a broader care team than most other skin cancers. Depending on the stage and the patient's history, Dr. Overman coordinates with oncology when appropriate to ensure that the surgical plan fits within the larger treatment picture.
For melanoma in situ, surgery alone is typically the treatment, and the main follow-up priority is surveillance. Patients who have had one melanoma are at elevated risk for additional melanomas and require regular full-body skin exams and dermoscopy monitoring. The frequency of those exams depends on personal and family history, the extent of the original lesion, and any additional risk factors.
For invasive melanomas managed with Mohs, sentinel lymph node biopsy may also be discussed, depending on tumor thickness and other pathologic features. These decisions are made in collaboration with oncology and are part of the conversation at the time of consultation.
Reconstruction after Mohs for melanoma follows the same principles as reconstruction after any Mohs procedure. Dr. Overman completed his fellowship at Oregon Health Science University, which included training in reconstructive and facial plastic surgery alongside Mohs micrographic surgery. Repair options include healing by secondary intention, primary linear closure, local flaps, and skin grafts, chosen based on the size and location of the defect.
Talk to Clearview Dermatology About Your Melanoma
If you have been diagnosed with melanoma or melanoma in situ and want to understand whether Mohs surgery is appropriate for your case, the team at Clearview Dermatology can help. Dr. Overman is a double board-certified dermatologist and fellowship-trained Mohs surgeon who has performed more than 8,000 Mohs surgeries and treats melanoma with immunohistochemical staining techniques. Call our office today to speak with an associate who can get you scheduled!
Candelas (Arvada): 14789 W 87th Pkwy, Arvada, CO 80005 | (720) 797-9184
Bergen Park (Evergreen): 32135 Castle Court, Suite 202, Evergreen, CO 80439 | (720) 694-8550
Dakota Ridge (Littleton): 13402 W Coal Mine Ave, Suite 360, Littleton, CO 80127 | (720) 909-8154
Frequently Asked Questions About Mohs Surgery for Melanoma
Is Mohs surgery approved for melanoma?
Mohs surgery is used for specific types of melanoma, particularly melanoma in situ and lentigo maligna, as well as thin superficial spreading melanoma in cosmetically sensitive locations. It is not the standard treatment for all melanomas, and the decision depends on the subtype, depth, and location of the tumor.
What is MART-1 staining and why is it used for melanoma Mohs?
MART-1, also called Melan-A, is an immunohistochemical stain that binds specifically to melanocytic cells, making melanoma cells clearly identifiable under the microscope. Standard frozen sections stained with routine dyes are less reliable for distinguishing melanoma cells from normal melanocytes, which is why specialized staining is required for accurate margin assessment.
How is Mohs for melanoma different from Mohs for other skin cancers?
The surgical technique is the same, but the lab process takes longer. Melanoma tissue requires immunohistochemical staining between stages rather than routine hematoxylin and eosin staining, which adds time to each stage of the procedure. Patients should expect a longer appointment than a standard Mohs case.
What is the difference between Mohs and wide local excision for melanoma?
Wide local excision removes the tumor with a fixed margin of surrounding tissue, then sends the specimen to a pathology lab for review over several days. The wound is closed before results return, and a second surgery may be needed if margins are positive. Mohs checks all margins in real time before the wound is closed, which can reduce the need for a second procedure and allows more precise tissue conservation.
Will I need to see an oncologist if I have Mohs for melanoma?
It depends on the stage and characteristics of your melanoma. For melanoma in situ, surgery is typically the primary treatment and oncology may not be required. For invasive melanomas, coordination with oncology is common and may include discussion of sentinel lymph node biopsy and surveillance planning.
What does follow-up look like after Mohs for melanoma?
After Mohs for melanoma, regular full-body skin exams and dermoscopy surveillance are essential. Patients who have had one melanoma are at elevated risk for additional lesions. The frequency of follow-up exams depends on the stage of the original melanoma, personal history, and any additional risk factors.
Which melanomas are not candidates for Mohs?
Thicker or deeply invasive melanomas -- those with greater Breslow depth, signs of lymph node involvement, or distant spread -- are typically managed with wide local excision and oncology involvement rather than Mohs. Melanomas on the trunk or extremities where tissue conservation is less critical may also be better suited to WLE. Your surgeon will evaluate your specific pathology to determine the appropriate approach.
Frequently Asked Questions About Clearview Dermatology
Who performs Mohs surgery at Clearview Dermatology?
Dr. Joe Overman performs all Mohs surgeries at Clearview Dermatology. He is a double board-certified dermatologist and Mohs surgeon who completed his fellowship in Mohs Micrographic and Reconstructive Surgery at Oregon Health Science University. He has performed more than 8,000 Mohs surgeries.
Does Clearview Dermatology use special staining for melanoma Mohs cases?
Yes. Clearview Dermatology uses MART-1 immunohistochemical staining for melanoma Mohs cases. This staining allows for precise identification of melanoma cells at the surgical margins, which is not reliably achievable with standard frozen section staining alone.
What skin cancers does Clearview Dermatology treat with Mohs?
Clearview Dermatology treats basal cell carcinoma, squamous cell carcinoma, melanoma in situ, and superficial spreading melanoma with Mohs micrographic surgery, among other skin cancer types. The appropriate treatment for each patient is determined during consultation based on the tumor's type, location, size, and depth.
Does Clearview Dermatology perform reconstruction after Mohs?
Yes. Reconstruction is performed at the time of Mohs surgery by Dr. Overman, who trained in reconstructive and facial plastic surgery as part of his Mohs fellowship. Repair options are chosen based on the size and location of the defect and may include primary closure, local flaps, or skin grafts.
How do I schedule a Mohs consultation at Clearview Dermatology?
Call our office today to speak with an associate who can get you scheduled!
Disclaimer: The information provided on this blog is for general informational purposes only and is not intended as, and should not be considered, medical advice. All information, content, and material available on this blog are for general informational purposes only. Readers are advised to consult with a qualified healthcare professional for medical advice, diagnosis, or treatment. The author and the blog disclaim any liability for the decisions you make based on the information provided. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
