A skin cancer diagnosis already creates enough uncertainty. The treatment day should not add unnecessary mystery.

Mohs micrographic surgery is different from a standard excision because the surgeon removes the cancer in stages and examines the tissue margins during the same visit. That means patients spend part of the day waiting while tissue is processed and reviewed under a microscope.

Thomas Dermatology’s Mohs surgery program includes board-certified, fellowship-trained Mohs surgeons serving patients in Nevada and Arizona. If Mohs has been recommended, this guide explains what the process generally looks like and which questions to ask your surgical team.

What Is Mohs Micrographic Surgery?

Mohs surgery is a specialized technique for removing certain skin cancers while preserving as much healthy surrounding tissue as possible.

The process combines surgery and microscopic margin examination. The visible tumor is removed, followed by a thin layer of tissue. That layer is mapped and examined. If cancer remains at a specific edge, the surgeon returns only to that mapped area and removes another layer.

The process repeats until the examined margins are clear.

The American Academy of Dermatology’s Mohs surgery guide explains that this ability to see where the cancer stops gives Mohs two important advantages: a high cure rate and preservation of healthy skin.

Why Mohs Is Often Used on the Face

Mohs can be especially valuable where both cancer clearance and tissue preservation matter.

Common locations include the nose, eyelids, ears, lips, scalp, hands, feet, and other areas where removing unnecessary healthy tissue could make reconstruction more difficult.

The procedure may also be recommended for cancers that are large, aggressive, recurrent, poorly defined, or in other higher-risk situations.

Mohs is not automatically the correct treatment for every skin cancer. The diagnosis, type, location, size, pathology, patient health, and prior treatment all influence the recommendation.

Who Performs Mohs Surgery?

Mohs is performed by physicians with specialized training in the technique, pathology interpretation, and reconstruction.

The American College of Mohs Surgery explains that its fellowship-trained members complete additional specialized training after residency in Mohs surgery, skin cancer pathology, and reconstruction.

Thomas Dermatology’s Mohs team includes fellowship-trained surgeons who manage both cancer removal and wound repair based on the individual defect.

Before the Surgery Day

Your surgeon’s instructions take priority over any general checklist online.

Before the procedure, the office may ask about:

• Current prescription medications
• Over-the-counter medications
• Vitamins and supplements
• Allergies
• Blood thinners
• Pacemakers or implanted devices
• Previous reactions to local anesthetic
• Recent illness
• Transportation needs
• Wound-care support at home

Do not stop a prescribed blood thinner or other medication simply because you read that it can increase bruising. Medication changes should be made only with guidance from the physicians involved in your care.

Because the length of a Mohs day is difficult to predict, patients are often advised to plan for a longer visit and bring something to read or watch while tissue is being processed.

What Happens When You Arrive?

The surgical team confirms the treatment site and reviews the plan. The area is cleaned and numbed with local anesthetic.

Most patients remain awake during Mohs surgery. The local anesthetic is used to numb the surgical site while the patient rests between stages.

The visible cancer is removed first, along with a thin layer of surrounding tissue.

Why Is There So Much Waiting During Mohs Surgery?

The waiting is part of the treatment, not a scheduling mistake.

After a layer is removed, it must be processed so the surgeon can examine the margins under a microscope. The tissue is carefully mapped so any remaining cancer can be traced back to a precise location on the surgical site.

If no cancer cells are seen at the margins, the removal phase is complete. If cancer remains, another thin layer is taken only from the area where it was detected.

The American College of Mohs Surgery procedure overview notes that most tumors require one to three stages, although individual cases vary.

This staged process is why patients should avoid scheduling another important appointment immediately after Mohs.

What Happens After the Cancer Is Removed?

Once the margins are clear, the surgeon evaluates the wound.

Possible approaches include:

• Allowing a small wound to heal naturally
• Closing the area with stitches
• Using a local skin flap
• Using a skin graft
• Coordinating a more complex reconstruction when needed

The choice depends on the size, depth, location, surrounding tissue, tension, function, and cosmetic considerations.

Thomas Dermatology also has a facial plastic surgery program for patients whose needs extend beyond routine closure or who are considering other facial procedures.

Will Mohs Leave a Scar?

Any procedure that removes skin creates a scar.

Mohs is designed to remove the cancer while sparing healthy tissue, which can reduce the size of the defect compared with removing a larger predetermined margin. The final scar still depends on the tumor size, location, number of stages, reconstruction, individual healing, and aftercare.

Scar appearance changes over time. Early redness, firmness, or unevenness may soften as healing progresses.

Thomas Dermatology also offers scar revision services for selected scars after healing, but most patients need time before judging the final appearance.

What Recovery Is Usually Like

Your surgical team provides wound-care instructions specific to the repair.

General advice may include keeping the bandage in place for a defined period, cleaning the wound as directed, applying the recommended ointment, limiting strenuous activity for a period of time, and returning for suture removal or follow-up when needed.

The American College of Mohs Surgery provides additional post-operative information for patients, but your surgeon’s instructions should be followed because different repairs require different care.

When to Call the Surgical Team

Contact the office when you have questions about bleeding, pain, swelling, drainage, wound separation, fever, or another symptom outside the instructions you were given.

Seek urgent medical attention for severe uncontrolled bleeding, signs of a serious allergic reaction, or other emergency symptoms.

Do not rely on a general article to determine whether a postoperative problem is normal. The team that knows the wound and repair is the correct source for advice.

Mohs Surgery Does Not End Skin Cancer Surveillance

Removing one cancer does not eliminate the risk of developing another.

Future skin checks, self-exams, and sun protection remain important. Thomas Dermatology’s guide to what to expect at a full-body skin cancer check explains how surveillance fits into long-term skin health.

Patients should also report new, changing, bleeding, or non-healing spots between scheduled visits rather than waiting for the next routine exam.

Questions to Ask Before Mohs Surgery

A preoperative conversation is a good time to ask:

• Why is Mohs recommended for this particular cancer?
• Who will perform the surgery?
• How should I handle my current medications?
• How long should I plan to be at the office?
• Can I eat normally that morning?
• Do I need someone to drive me?
• What reconstruction options are likely?
• What should I bring?
• What activity restrictions should I expect?
• Who do I call if I have a problem after hours?

Clear instructions reduce anxiety and make the day easier to plan.

Mohs Surgery at Thomas Dermatology

Thomas Dermatology has provided skin cancer care for more than 30 years. Its dedicated Mohs micrographic surgery service combines staged cancer removal, on-site microscopic review, and reconstruction by experienced dermatologic surgeons.

The practice also provides general dermatology, full-body skin exams, radiation therapy for selected skin cancers, cosmetic dermatology, and facial plastic surgery.

Visit the Thomas Dermatology locations page for current Nevada and Arizona office information.

Frequently Asked Questions About Mohs Surgery

Are you awake during Mohs surgery?

Most Mohs procedures are performed using local anesthesia, so the patient remains awake while the treatment area is numb.

How long does Mohs surgery take?

It varies. Each stage requires tissue processing and microscopic examination, so the total time cannot be predicted precisely in advance. Plan for the visit to take a significant part of the day.

How many stages will I need?

Many cancers clear within a small number of stages, but the exact number depends on microscopic tumor extension and cannot be guaranteed before surgery.

Is Mohs only used for basal cell carcinoma?

No. It is commonly used for selected basal cell and squamous cell carcinomas and can be used for certain other skin cancers in appropriate situations.

Will the surgeon close the wound the same day?

Often, yes, but the repair method depends on the wound. Some wounds heal naturally, while others require stitches, a flap, a graft, or additional reconstructive planning.

Know the Process Before the Treatment Day

Mohs surgery is precise because removal and microscopic examination happen together, stage by stage.

Understanding that process makes the waiting, mapping, and reconstruction decisions easier to anticipate.

Schedule an appointment with Thomas Dermatology if you have been diagnosed with skin cancer or need an evaluation of a suspicious lesion.

*This article is for general educational purposes and is not a substitute for instructions from your surgeon. Follow the medication, wound-care, and activity guidance provided by your treating medical team.*