A Day in Mohs: Step by Step
Key Reassurances
- Mohs is an outpatient procedure. No hospital stay needed
- You are awake and comfortable throughout under local anesthesia
- Most cases take 2–4 hours total
- You can eat, drink, and bring entertainment during waiting periods
- Your surgeon handles both cancer removal and wound repair
Before You Arrive
Preparation makes the day easier:
Practical Tips
- Eat a normal breakfast. You are not going under general anesthesia
- Take your regular medications unless your surgeon has instructed otherwise
- Wear comfortable, button-front clothing (avoid pullovers for head/neck surgery)
- Bring entertainment: book, tablet, phone + charger, headphones
- Bring snacks and water for the waiting periods
- Arrange a ride home if the surgery site may affect your driving comfort
- Bring a companion if you’d like support
Step 1: Arrival & Preparation
You’ll be welcomed by the surgical team and taken to the procedure room. The surgeon will mark the visible tumor boundaries, take preoperative photographs, and review the plan with you. The surgical site is cleaned and prepared.
Step 2: Numbing & First Excision
Local anesthesia is injected (the only uncomfortable part. About 10–15 seconds of stinging, then complete numbness). The surgeon removes a thin layer of tissue around and beneath the visible tumor. A temporary bandage is applied, and you move to the waiting area.
Step 3: The Laboratory (30–45 Minutes)
This is the heart of Mohs surgery. Your tissue is color-coded with dyes, mapped on a diagram, frozen, cut into ultra-thin sections, stained, and examined under the microscope by your surgeon. Every millimeter of the margin is checked for residual cancer cells. During this time, you wait comfortably.
Step 4: Results
Your surgeon will inform you of the results:
• If all margins are clear: proceed to reconstruction (wound closure)
• If cancer remains at a specific margin: only that area is re-excised (another stage), and the process repeats
Most cases require only 1–2 stages.
Step 5: Reconstruction
Once all margins are confirmed clear, your surgeon closes the wound using the technique best suited to your specific situation. This may include direct suturing, a local flap, or a skin graft. The goal is both functional integrity and the best possible cosmetic outcome.
Step 6: Discharge
You’ll receive detailed wound care instructions, pain management guidance, and follow-up appointment scheduling. Most patients leave the clinic feeling well, with a manageable bandage and minimal discomfort.
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About This Article
Author: Dr. Yehonatan Kaplan, M.D., Fellow ACMS
Last Medical Review:
Audience: Patients
Clinic: Kaplan Clinic · DermUnbound Research Program