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What is a Dermatologist? A Medical Specialist's Long Training Journey

May 14, 2025
*Photos are of models, not actual patients.

A dermatologist is a physician specializing in treating over 3,000 different conditions affecting the skin, hair, nails, and mucous membranes—including medical concerns like skin cancer, psoriasis, and contact dermatitis, as well as cosmetic improvements for wrinkles and acne scars—requiring extensive training through four years of medical school, a highly competitive dermatology residency program (one-year internship plus three years of specialized training), optional fellowship subspecialization (like Mohs Micrographic Surgery or pediatric dermatology), and board certification requiring both rigorous examination and ongoing education to maintain credentials, making them uniquely qualified to provide comprehensive skin care.

What Is a Dermatologist? A Medical Specialist's Long Training Journey

What Does a Dermatologist Do?

This sounds like a simple question.  However, last month I was at a dinner party and someone asked me this question in an earnest fashion.  No one had ever asked me that before but I’m sure several may wonder.  In essence, a dermatologist is a doctor who specializes in treating the skin, hair, nails and mucous membranes.  Dermatologists treat more than 3,000 different skin diseases including skin cancer, psoriasis, contact dermatitis and nail disorders.  Dermatologists may specialize in one or more areas of sub-specialization.  In addition to treating skin disease dermatologists also work to improve the appearance of their patients skin such as treating wrinkles, ages spots, signs of aging and acne scars.

How Long Does It Take to Become a Dermatologist?

The road to becoming a dermatologist is a long one.  To become a dermatologist after graduating from college one must attend a four-year medical school.  During medical school one must apply for a residency in dermatology. Because of the competitive nature most people who apply for a residency in dermatology are disappointed not to get one.  Following medical school one must then do a 1-year internship followed by a three-year residency in dermatology.

What Is a Dermatology Fellowship?

After graduation from residency some dermatologists will obtain additional training in an area of sub-specialization.  This is known as a fellowship.  I was fortunate to perform my advanced fellowship training at UCSF where I received intense training in Mohs Micrographic Surgery, Laser Surgery and Cosmetic Dermatology.  Other fellowships include dermatopathology, pediatric dermatology and research.

What Does “Board-Certified Dermatologist” Mean?

Upon graduation from ones residency in dermatology a doctor is considered “board eligible” but not “board certified.”  Following ones residency most people seek board certification.  This requires having completed a residency in dermatology.  One must then sit for a proctored lengthy examination administered by the American Board of Dermatology, which is one of the boards recognized by the American Board of Medical Specialties.  Prior to the early 1990’s when one took ones board exam they issued a lifetime certificate.  Since the early 1990’s (when I trained), one receives a time-limited board certification requiring retesting and continuing education to maintain board certification.  I am fortunate to be a board-certified dermatologist with advance fellowship serving this wonderful community.