Dr. Daniel Siegel, MD

Physician Dermatology

Specializes in Dermatologic Surgery, Mohs Surgery

Smithtown, New York View map

Dr. Daniel Siegel, MD

Medical Expertise

Dr. Siegel is a NYC dermatologist with particular expertise in the use of Mohs surgery for the treatment of Skin Cancer. Dr. Dan Siegel previously served as President of the American Academy of Dermatology (AAD) and remains active in a variety of esteemed professional organizations.

Dr. Siegel has received many honors including the AAD Presidential Citation for exceptional contributions to the Academy and the field of dermatology.

Tips & Wisdom

Mohs surgery offers the highest cure rates available today and is considered the gold standard of treatment for skin cancers involving the head, face, neck, hands, feet and cosmetically sensitive areas.

All anesthesia is local and surgeries are performed in an office setting.

It takes 5 to 30 minutes to remove each layer of tissue and 1 to 2 hours to process and examine it.

Most tumors require the removal of one or two layers, but since this is not known until surgery has begun, we ask patients to put aside 2 to 6 hours of time when they schedule their surgical appointment.

To optimize wound healing, we recommend keeping the wound as moist as possible. We usually recommend applying an ample amount of Vaseline to the wound two or more times a day.

The chances of getting another skin cancer, such as a basal cell carcinoma or a squamous cell carcinoma, are greater after you have already had one. It can appear anywhere on the body, but most commonly on sun-exposed areas.

Learn More

Before you slip over to the beach to catch up on your tan this summer, don’t forget to slop on the sunscreen. Remember that protecting yourself from sun exposure is the best way to prevent skin cancer and premature aging of the skin, such as unwanted wrinkles and age spots.

I recommend generously applying a water-resistant, broad-spectrum sunscreen— that protects against both types of ultraviolet radiation (UVA and UVB) — with an SPF 30 or higher, in conjunction with other sun-safe practices such as limiting sun exposure, seeking shade, and wearing sun-protective clothing, hats and sunglasses.”

But what about vitamin D? Many people worry that sunscreen will block vitalizing vitamin D from being absorbed. Even though sun exposure stimulates the production of vitamin D in the skin, there are many other, safer ways to get the vitamin without putting yourself in harm’s way. Dr. Siegel recommends that individuals who are concerned about their vitamin D intake “should discuss obtaining sufficient vitamin D from foods and/or vitamin supplements with their doctor.”

Dr. Siegel provided his expert opinion about sunscreen ingredients, particularly those that have received attention in the press.

1) Oxybenzone is one of the few FDA-approved ingredients that provides effective broad-spectrum protection from UV radiation. Although there has been some concern mentioned in the press about possible long-term side effects from using sunscreens with oxybenzone, Dr. Siegel pointed out that “peer-reviewed scientific literature (available to date) and regulatory assessments from national and international bodies do not support a link between oxybenzone in sunscreen and hormonal alterations, or other significant health issues in humans. He added that “the FDA has approved oxybenzone in sunscreen for use on children older than 6 months.”

2) Retinyl palmitate, a form of vitamin A (retinol), is used as an ingredient in some sunscreens as an antioxidant to prevent degradation of the product and maintain efficacy. There has been recent attention about possible side effects from retinyl as a result of in vitro (test tube) studies and one unpublished report using mice. However, Dr. Siegel stated that“there is no published evidence to suggest either increase the risk of skin cancer in these patients. In fact, oral retinoids are used to prevent skin cancers in high-risk patients.”

3) Nanotechnology is being explored as a means to give sunscreen greater broad spectrum protection from UVA and UVB rays. Titanium dioxide and zinc oxide tend to leave a white residue on the skin when used in a regular formulation that contains large particles. When these ingredients are converted into  smaller molecules, nanoparticles, they appear to vanish on the skin, do not leave a residue, and retain and enhance their ability to block UVA and UVB light. “Considerable research on the use of nanoparticles on healthy, undamaged skin has shown that the stratum corneum — the outermost layer of the skin — is an effective barrier to preventing the entry of nanoparticles into the deeper layers of the skin.  Titanium dioxide and zinc oxide have a long history of safe use in sunscreens and offer good options for broad-spectrum UV protection.”

Everyone wants to have a fun and safe summer. By adding sunscreen to your daily routine, like brushing your teeth and washing your hands, the small step can have a big payoff and add years to your life down the line.

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About Me

Dr. Daniel Mark Siegel, MD is a board-certified dermatologist and Mohs surgeon providing care to patients in the New York City and Long Island Skin Cancer and Dermatologic Surgery.

Dr. Daniel M. Siegel also serves as Clinical Professor of Dermatology at the State University of New York (SUNY) at Downstate School of Medicine, directs the American College of Graduate Medical Education (ACGME) approved Procedural Dermatology Fellowship and the American College of Mohs Surgery training program, and spends part of his week at the Brooklyn Veterans Administration (VA) Hospital.

He currently is member of the Board of Directors of both the American Academy of Dermatology and the American College of Mohs Surgery.

Dr. Siegel previously founded and directed the first Mohs and Dermatologic Surgery unit at University of Texas Southwestern Medical Center - Parkland Memorial Hospital.

In addition to multiple esteemed national organizations, Dr. Siegel has membership in several local professional organizations, including:

  • Long Island Dermatologic Society
  • Suffolk County Dermatology Society
  • Suffolk County Medical Society
  • Medical Society of the State of New York.

Dr. Dan Siegel is an author of two books and over two dozen referenced medical publications and is co-editor of The Physician's Internet Review for Dermatologists. In addition, he is on various editorial boards in the field of dermatology and is a contributing editor to the Dermatologic Surgery journal.

Education & Training

Born and raised in New York, Dr. Siegel is a graduate of Stuyvesant High School (often called the best high school in America). After this he attended Rensselaer Polytechnic Institute where he received his magna cum laude undergraduate education as part of a combined six year biomedical program with Albany Medical College from which he received his Doctor of Medicine Degree in 1981.
  • Medical Degree: Albany Medical College
  • Medical Internship: Albany Medical Center
  • Dermatology Residency: University of Texas Southwestern - Parkland Health & Hospital System
  • Mohs Micrographic Surgery and Dermatology Surgery Fellowship: Baylor College of Medicine
  • Other Training: Averell Harriman School for Management and Policy, State University of New York at Stony Brook
  • Other Training: Rensselaer Polytechnic Institute

Long Island Skin Cancer & Dermatologic Surgery

We are dedicated to the state-of-the-art treatment of all dermatologic conditions. Our physicians bring their skills, experience and dedication together striving to exceed patient expectations by offering comprehensive and compassionate care in our modern, technologically advanced facilities. Our goal is to make significant and ongoing contributions to the health and well being of our patients and community.

Primary Location

Smithtown Office
994 W. Jericho Turnpike, Suite 103
Smithtown, New York, 11787

(631) 864-6647

This information is for general educational uses only. It may not apply to you and your personal medical needs. This information should not be used in place of a visit, call, consultation with or the advice of your physician or health care professional.

Communicate promptly with your physician or other health care professional with any health-related questions or concerns.

Be sure to follow specific instructions given to you by your physician or health care professional.

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