Katherine A. Siamas, M.D.

Katherine Siamas, MD is a board-certified dermatologist at Schweiger Dermatology Group.

Dr. Siamas received her medical degree from SUNY Stony Brook School of Medicine in Stony Brook, New York, where she made the national dean’s list. Dr. Siamas completed her dermatology residency at SUNY Downstate Medical Center in Brooklyn, New York. She is an assistant clinical professor of dermatology at Stony Brook University Hospital. Dr. Siamas is a member of the American Academy of Dermatology, the American Society for Dermatologic Surgery, the Women’s Dermatologic Society and the American Medical Association.


  • Board Certified Dermatologist
  • Member of the American Academy of Dermatology
  • Member of the American Society for Dermatologic Surgery
  • Member of the Women’s Dermatologic Society
  • Member of the American Medical Association


  • General Dermatology


  • Received Medical Degree from SUNY Stony Brook School of Medicine in Stony Brook, New York
  • Dermatology Residency from SUNY Downstate Medical Center in Brooklyn, New York
  • Assistant Clinical Professor of Dermatology at Stony Brook University Hospital

I got a same day appointment and great answers to all my questions. Office was very clean. I checked in and was seen even before I had a chance to sit down. So glad I didn’t have to wait in the reception area for an hour like with my old dermatologist.



260 Middle Country Road
Suite 208
Smithtown, NY 11787

Call: 631-863-3223

Book Appointment




$100 off

a $500

Cosmetic Treatment

Be the first to know about
skincare tips,
news and special offers!

Continue To Site