Halsey Dermatology

Serving the Hamptons since 2018

ALERT: For your safety, Dr. Mark Halsey completed his booster (3rd dose) of the COVID19 vaccine (Pfizer) on September 26th, 2021. In accordance with state guidelines, all staff in our office have also completed their COVID19 vaccination series. Read about the extensive COVID19 safety measures we take here.


To deliver world-class dermatology and skin care to the entire Hamptons community, in a safe, clean, and comfortable practice,
led and owned by physicians.


To fortify our role as the leading general, cosmetic, procedural, and pediatric dermatology practice on Eastern Long Island, working in collaboration with other health care providers in the community.

Tell Me More

Mark Halsey, MD, FAAD

Dr. Mark Halsey, MD is a double board-certified dermatologist practicing general, cosmetic, and pediatric dermatology on the South Fork. Dr. Halsey received his undergraduate degree in Mathematics from the Massachusetts Institute of Technology. He graduated from the University of South Florida College of Medicine, where he was a member of the Alpha Omega Alpha medical honor society, and served as president of his medical school class.

Dr. Halsey completed his internship at the world-renowned Massachusetts General Hospital (Harvard Medical School), followed by dermatology residency at the University of Massachusetts, where he served as Chief Resident in his final year. He then completed additional training in pediatric dermatology at Boston Children's Hospital (Harvard Medical School, Dept. of Dermatology) to obtain a second board certification in pediatric dermatology. He completed the American Society of Dermatologic Surgery Preceptorship program to gain additional expertise in cosmetic dermatology, and minimally invasive procedures of the skin.

He holds a faculty appointment at the Ronald O. Perelman Department of Dermatology at NYU, where he has taught residents and medical students as an Assistant Clinical Professor of Dermatology since 2016, and previously held a training appointment at Harvard Medical School.

Dr. Halsey is a Diplomate of the American Board of Dermatology, with dual board certifications in Dermatology and Pediatric Dermatology. He is a Fellow of the American Academy of Dermatology and the American Society for Dermatologic Surgery, and a member of the Society for Pediatric Dermatology.

His practice interests are in procedural, cosmetic, pediatric, and general dermatology. He maintains a clinically focused and patient-centered practice. He has multiple publications in peer-reviewed research journals, and currently serves as a reviewer for the Journal of the American Academy of Dermatology.

Mark Halsey has deep ties to the south fork, with family living in the Hamptons for the past 13 generations. He lives in Water Mill, with his wife, June, and his 3 children.

Society for Pediatric Dermatology
American Society for Dermatologic Surgery
American Academy of Dermatology
American Board of Dermatology

Ashton Wilson, PA-C

Diplomate Fellow, Society of Dermatology Physician Assistants

Ashton Wilson, MSPAS, PA-C is a board-certified New York-licensed Physician Assistant specializing in medical and cosmetic dermatology. She received her Masters Degree from Pace University’s PA program, receiving clinical training at many of NYC’s top medical centers including NYU Langone Health, Lenox Hill Hospital and Maimonides Medical Center.

Ashton is a Diplomate Fellow with the Society of Dermatology Physician Assistants, qualified to evaluate and treat a wide range of skin conditions for patients of varying ages, cultural backgrounds, and skin types. She is a member of the Society of Dermatology Physician Assistants, New York State Society of Physician Assistants, as well as the American Academy of Physician Assistants.

Ashton attended the University of Florida on fully paid presidential merit-based scholarship, graduating with her Bachelor’s degree in Health Sciences, with minor degrees in both Health Disparities in Society and Public Health. Born and raised in the panhandle of Florida, Ashton is well-versed in the long-term effects of sun exposure and strongly believes in the power of prevention and patient education regarding sun protection and skin cancer screenings.


Dr. Mark Halsey chose his career as a path to serving the members of his community. Twice a month, he travels to Manhattan to volunteer at Bellevue Hospital Center, offering his unique expertise as a double board-certified dermatologist in general and pediatric dermatology. He is one of only roughly 300 fellowship-trained board-certified pediatric dermatologists in the entire United States, with his pediatric training occurring at arguably two of the most respected hospitals in the world, Massachusetts General Hospital and Boston Children's Hospital. His volunteer clinics in NYC allow him to teach dermatology and pediatrics residents at NYU, and share his unique training and skillset with the community, including children in need who may be otherwise unable to access care.

Our Amazing Team

Our team of assistants is ready to take your call and help you have a fantastic appointment.



Assistant Extraordinaire



Assistant Extraordinaire



Assistant Extraordinaire



Assistant Extraordinaire

Our team of assistants is eager to help you get the best possible dermatology care. They help with scheduling your appointment, taking care of you while you visit our office, coordinating insurance coverage, and arranging follow-up care.

Medical Services

Halsey Dermatology offers expert care in a variety of dermatology disciplines

General Dermatology

Skin cancer, moles, acne, rashes, and more

Dermatologic Surgery

Expert skin surgery done comfortably in our office

Pediatric Dermatology

Pediatric dermatology from one of the foremost experts in the country


We strive to make our services accessible to the community. Our goal is to accept all insurance willing to offer us fair rates for the services we offer. Nonetheless, for those with a "narrow network" or who do not have insurance, we offer competitive self-pay rates. Please call our office at (631) 731-1099 to find out more! Our practice has current contracts with the following companies:

  • Aetna
  • Blue Cross Blue Shield (Empire BCBC)
  • Cigna
  • Emblem (GHI)
  • Emblem (HIP)
  • Elderplan
  • Empire Plan (NY State)
  • Fidelis
  • GHI
  • HIP
  • Humana (Choice Care) Medicare
  • Local 1199
  • Medicare
  • Capital District Health Plan (Medcal)
  • Multiplan/PHC Savility
  • NYC Medicare Advantage Plus Plan
  • Oxford (Freedom, Liberty, and Medicare)
  • Railroad Medicare
  • Suffolk County Teachers / Island Group
  • UnitedHealthcare
  • UnitedHealthcare Community Plan
  • VillageCareMAX

Prior to your appointment, please call our office or speak to your insurance company to determine if our practice participates with your particular plan. We do not participate with "health share" plans or other non-insurance entities, but patients may still see us using our self-pay rates, with payment due at time of service.

For those whose plans require a referral to see a specialist, it is each patient's responsibility to request a referral from their primary care physician in advance to ensure coverage for the visit.

Home Visits

For patients requiring an additional measure of privacy, Halsey Dermatology offers dermatology appointments offsite at a private home, office, or estate. Patients utilizing this service must agree to pay for travel expenses. All patients are screened for coronavirus risk prior to their home visit. For more information, or to schedule a home visit, please call our office at (631) 731-1099 and ask for Emma.

Cosmetic Dermatology and Laser

World class aesthetics and laser, with a portfolio featuring the latest brands and devices

Dr. Mark Halsey, MD has extensive knowledge and experience in cosmetic dermatology and laser and device-based therapeutics. He offers cosmetic consultations to patients who desire to enhance the quality and appearance of their skin.

At a cosmetic consultation appointment, Dr. Halsey listens to each patient's cosmetic concerns and offers suggestions as to which products and methods would work best for them. Using the latest Vectra H2 technology by Canfield Scientific, Dr. Halsey is able to plan and simulate procedures in 3D, and track treatment results. We curate the best and most suitable treatments for each candidate with our wide range of offerings.

Botox and Botulinum Toxins Hyaluronic Acid Fillers Lasers and Devices

  • Acne (light therapy)
  • Acne scars
  • Age spots
  • AquaGold
  • Belotero
  • Birthmarks
  • Blood vessels
  • Botox / Xeomin / Dysport / Jeuveau
  • Chemical peels
  • Daily regimen formulation
  • Excess sweating
  • Fillers
  • Fine lines
  • Freckling
  • Hair loss
  • Hand spots
  • Hemangiomas
  • Hyaluronic Acid
  • Hyperhidrosis
  • Intense Pulsed Light (IPL)
  • Juvéderm
  • Laser hair removal
  • Leg veins
  • Non-invasive skin rejuvenation
  • Photodynamic therapy (Ameluz)
  • Photofacial rejuvenation
  • PRP (Platelet Rich Plasma)
  • Radiesse
  • Restylane
  • RF Microneedling
  • Rosacea
  • Saggy skin
  • Sclerotherapy
  • Skin laxity
  • Spider veins
  • Sun spots
  • Tattoo removal
  • Unwanted hair
  • Versa
  • Wrinkles

Botox and Botulinum Toxins

Dr. Halsey has extensive experience in using Botox and all other brands of botulinum toxin to address facial wrinkles. Halsey Dermatology offers Botox, Xeomin, Dysport, and Jeuveau. As a Revance Prestige Partner, we will be offering Daxi, the newest toxin to become FDA approved, as soon as it becomes available in 2021.


Simply put, botulinum toxins like Botox soften facial wrinkles by reducing the tone and strength of the muscles that are causing them. When these muscles are relaxed the wrinkles become less prominent or are eliminated.

The exact length of the effect depends on the patient, but most patients get between 3-4 months of benefit. We anticipate that Daxi, when it becomes available will have a longer approved duration. Our office will be one of the first to offer this new product.

Dr. Mark Halsey will discuss the risks, benefits, and alternatives to botulinum toxin with you at your consultation. Nonetheless, most patients experience little to no side effects and are quite pleased with their results.

That’s a great question. Our office carries all brands of cosmetic use botulinum toxin as a convenience to our patients, knowing that patients who have experience with botulinum toxin may already have a preference. Dr. Halsey has experience with all four brands of toxin approved for cosmetic use, and can help you select what’s best for you.

Hyaluronic Acid Fillers

For deeper wrinkles, sagging skin, flattened lips, and other forms of volume loss, Dr. Halsey is an expert in the use of facial fillers, including hyaluronic acids such as Juvéderm, Restylane, RHA, Versa, and Belotero. Most importantly, his office purchases only authentic products directly from the manufacturer's offical US representative, never any knock-offs or imports. The safety and comfort of our patients always comes first and foremost.


Hyaluronic acid is a naturally occurring substance made by cells in our bodies. It has a remarkable ability to hold onto water, making it useful to plump up skin and restore lost volume.

In aesthetics, hyaluronic acid picks up where botulinum leaves off. Hyaluronic acids address wrinkles and sagging skin that occur when facial fat and volume is lost. These remarkable gels can also be used to rehydrate the surface of the skin with a microdroplet technique.

While it may vary, hyaluronic acid fillers generally last between 8 months and 2 years, depending on the exact product and the location it is placed.

The selection of the product depends on the location the product is being placed. We carry a wide selection of products, from Juvederm, Restylane, Belotero, Versa, and RHA. We will gladly help the selection of the product that would best address any particular issue.

One of the greatest things about hyaluronic acid fillers is that the result is immediate — a response is seen with each injection.

Hyaluronic acid fillers are FDA approved, and generally considered safe. All medical procedures have risks, and while patients may experience some discomfort and potential bruising, significant side effects are rare. A thorough discussion of risks, benefits and alternatives will be part of your hyaluronic acid filler visit.

Lasers and Devices

Dr. Halsey offers in-office treatments using a number of laser and devices to address pigment, wrinkles, skin irregularities, blood vessels, birthmarks, benign skin lesions, unwanted hair, and other skin issues. Device-based treatments for male and female pattern hair loss are also available.

Glacial Rx
Lutronic Ultra


Deka Tetra
Deka Luxea

Fractional laser rejuvenation is a technique whereby a laser delivers energy to fractions or columns of the skin, leaving surrounding skin spared. The advantage of this technique is that with surrounding unaffected skin, these small treated columns of skin heal quickly, reducing unwanted downtime and leading to a more comfortable and manageable recovery.

Our practice offers each form of fractional laser rejuvenation — ablative and non-ablative, both of which we recommend depending on the needs of each patient. Our ablative rejuvenation technology is able to stimulate new columns of skin to form by breaking through the surface of the skin and penetrating as deep as the dermis (the second layer of skin). Ablative lasers create more dramatic effects, but with a longer recovery. Meanwhile, non-ablative technology stimulates new skin to form in a similar fashion, but without breaking the stratum corneum (the uppermost barrier layer of the skin). This technology often allows for a shorter recovery period.

RF Microneedling is an innovative technique used to rejuvenate the skin’s underlying collagen layer with remarkable results. RF microneedling involves using a device (Virtue RF) to insert very fine needles into the skin. Energy is then delivered to the tips of the needles, stimulating the collagen fibers deep in the skin to grow and thicken over the subsequent weeks. Patients love the enhanced thickness and elasticity of their skin. We usually recommend a series of 3 treatments, spaced apart by 3-4 weeks.

Our RF microneedling system, Virtue RF, is the latest and greatest device from the same designers of the Vivace, one of the first and most successful RF microneedling devices available. The Virtue RF distinguishes itself by gentle, quiet and comfortable needle insertion, and a wider array of settings to cater to each patient's needs.

With Virtue RF, a numbing cream is applied, and treatment begins thereafter. Often pressure and a warm sensation is felt during treatment. Downtime is usually minimal, with the treated area usually returning from slightly pink after treatment back to baseline within 24 hours. Mineral based makeup and sunscreen can be worn as soon as the following day.

Glacial Rx is an innovative facial and sun spot treatment system using technology developed at MGH, where Dr. Halsey began his medical training. It uses the power of cold to treat sun spots and reduce pigment production. During a Glacial Rx treatment, the skin is rejuvenated using a combination of serums, masks, and a specially designed skin cooling tip. This proprietary system is soothing and relaxing, delivering the power of a laser with the comfort of a facial. It is an easy and comfortable way to even skin tone and soften the skin any time of year, even in the summer.

Intense Pulsed Light is a rejuvenating treatment for the skin utilizing white (visible) light to treat unwanted brown pigment and fine vessels / redness in the skin.

IPL treats unwanted pigment and redness with minimal downtime. Most patients have temporary facial redness that lasts approximately 24 hours. Brown spots are typically somewhat darker until flaking off one to two weeks later.

Similar to most medical procedures, laser and device-based treatments do carry risks and benefits. These will be discussed with you at length at your consultation to empower you to make sound choices for treating your skin.


All patients and providers are invited to call us at (631) 731-1099

Existing patients may use our Patient Portal to communicate with staff, request refills, see results, and update medical history information.


Our Sag Harbor office is conveniently located at 3350 Noyack Rd, in the Burkeshire Court development. As you enter the Burkeshire Court complex, go left and follow the driveway to the rear building (Building A) where plentiful parking is available onsite.

Sag Harbor Office

3350 Noyack Rd
Sag Harbor, NY 11963
(Enter Burkeshire Court and take the driveway on the left as you enter)

Billing Address

(For submitting payments to our billing company)
Halsey Dermatology MSC#666
PO Box 830529
Birmingham, AL 35283-0529

All patients and providers are invited to call us at:
(631) 731-1099.

From our beautiful new office in Sag Harbor, we serve the entire Hamptons community, including Riverhead, Westhampton, Westhampton Beach, Quogue, East Quogue, Hampton Bays, Southampton, North Sea, Noyack, Water Mill, Sag Harbor, North Haven, Shelter Island, Bridgehampton, Sagaponack, Northwest Harbor, Wainscott, East Hampton, Springs, Amagansett, Napeague, and Montauk.

Online Forms

Patients seeing us virtually should kindly complete their forms online, while patients who visit our office will be asked to complete their forms on-site.

Notice on Coronavirus

Your skin is important to us, and so is your health and the health of our employees. We remain open to provide dermatology services to our patients during this health crisis. We diagnose and treat 30+ skin cancers each month, treat precancerous skin conditions, and manage acute and chronic rashes with substantial effects on quality of life. To meet the needs of the community during this difficult time, we have taken the following additional safety measures to protect our patients and staff:

  • Dr. Mark Halsey completed his two-dose COVID19 vaccination series (Pfizer) on January 11th, 2021. In accordance with state and CDC guidelines, all clinical support staff have also completed their COVID19 vaccination series.
  • We continue to offer online "virtual visits" with live/synchronous 2-way video and audio to allow patients to receive care while in the comfort and safety of their homes
  • All our staff will be wearing masks at all times while patients are in the office. Patients are required to wear masks while in the office, and may remove them as needed during their examination.
  • HEPA filters with UV sterilizers are installed in all patient rooms and common areas.
  • Patients are screened for fever and coronavirus exposure risk upon arrival.
  • Patients will be isolated from each other in patient rooms to the greatest extent possible. Our goal is to have every patient in a private room within 2 minutes of arrival.