Double Board-Certified Dermatologist: What It Means and Why It Matters

When you search for a dermatologist, you'll see terms like "board-certified," "fellowship-trained," and "double board-certified" — often without explanation. For routine skincare and annual skin checks, standard board certification is appropriate and rigorous. But for skin cancer surgery, specifically Mohs micrographic surgery, that second certification changes what you can expect from your care.

What board certification in dermatology means

Board certification from the American Board of Dermatology (ABD) is the baseline credential for a practicing dermatologist in the United States. To earn it, a physician must:

• Complete medical school (4 years)
• Complete an internship year
• Complete a 3-year dermatology residency training program
• Pass a comprehensive written and practical examination administered by the ABD

This process takes approximately 11–12 years from starting college. A board-certified dermatologist is fully qualified to diagnose and treat the full spectrum of skin conditions — including medical, surgical, and cosmetic dermatology.

What the second certification in Mohs surgery means

The second board, in Mohs Micrographic Surgery, requires additional training beyond residency:

• Completion of a 1–2 year fellowship in a program accredited by the American College of Mohs Surgery (ACMS)
• Supervised case volume requirements (hundreds of Mohs cases under direct supervision)
• Proficiency in on-site tissue processing, frozen section histopathology, and margin analysis
• Competency in complex wound closures — flaps, grafts, layered repairs

Not every dermatologist chooses to pursue this fellowship. Those who complete it — and receive ACMS certification — have demonstrated mastery specifically in the surgical, pathological, and reconstructive aspects of skin cancer removal.

The 5 key differences between board-certified and double board-certified

1. Pathology skills

A double board-certified Mohs surgeon reads their own slides under the microscope. Standard dermatologists performing excisions typically rely on outside pathology labs, which can delay results by days and cover only a fraction of the tumor margin.

2. Intraoperative decision-making

The ability to interpret microscopic margin findings in real time — and know exactly where to take the next stage — requires dedicated histopathology training. This is what allows Mohs to achieve near-complete margin examination.

3. Reconstruction expertise

Complex closures on the face (around the eye, nose, lip, or ear) require reconstructive skill developed during fellowship. Double board-certified surgeons plan closures that minimize scarring and preserve function.

4. Cure rate outcomes

Mohs surgery achieves cure rates of up to 99% for primary basal cell carcinoma when performed by a fellowship-trained surgeon. Outcomes from minimally trained practitioners who call a procedure "Mohs" without proper histopathology are not equivalent.

5. Recurrent and complex cases

Board-certified Mohs surgeons are specifically trained for recurrent tumors — cases where prior excisions left residual cancer. These cases require the most sophisticated margin interpretation and the largest safety margin skill.

How to verify your surgeon's credentials

• Check the American Board of Dermatology website (abdermatology.com) to verify board certification status
• Check the American College of Mohs Surgery directory (mohssurgery.org) to confirm fellowship training
• Ask the surgeon directly during your consultation: "Are you ACMS fellowship-trained and double board-certified?"

At Miami Skin Center

Dr. Puyana is double board-certified in both Dermatology and Mohs Micrographic Surgery, trained in an ACMS-accredited fellowship. Patients at her Coral Gables practice receive surgical care performed and interpreted by the same physician — from the first tissue stage through final reconstruction — without any handoff to an outside lab or a different surgeon.

Bottom line

Board certification confirms that a dermatologist has mastered general dermatology. The second certification in Mohs Micrographic Surgery confirms mastery of the precise histopathological and reconstructive skills that define the procedure's superior outcomes. When skin cancer on the face or another critical area is involved, that distinction is worth understanding before you choose your care.