Book an Appointment
Qualifications and Experience
Long Island native Dr. Michael Fastenberg is a board-certified dermatologist at Schweiger Dermatology Group in Smithtown, New York. Dr. Fastenberg attended Jericho High School and received his undergraduate degree from Duke University (cum laude). Dr. Fastenberg returned to Long Island after working and living in various places around the world. He received his medical degree from the Stony Brook School of Medicine (Alpha Omega Alpha) and completed his internship in internal medicine at Winthrop University Hospital in Mineola. He then completed his dermatology residency at the University of North Carolina Hospitals in Chapel Hill, NC. He has performed research in biochemistry, cell biology and dermatology, has been published in peer reviewed journals and has presented at local and national meetings. Dr. Fastenberg specializes in general adult, pediatric and surgical dermatology as well as cosmetic dermatology, including Botox, fillers and laser procedures. Dr. Fastenberg is on faculty at St. Catherine of Siena Medical Center in Smithtown, NY.
Verified Patient Reviews
Dr. Fastenberg is very nice, knowledgeable and has a great bedside manner. He's not an alarmist and has put my mind at ease on several occasions. I have, and will continue to recommend him to friends and family.
Doctor Fastenberg, is a highly competent professional, with a pleasant and reassuring personality, always with a smile. His medical assistants are equally as pleasant, always presenting themselves in a professional manner. Many thanks for their professional service.
He and his staff are friendly and professional!
Dr. Fastenberg is wonderful; caring, personable and professional. Sad that we have to post "poll comments" in this era.
I have taken my daughter to see Dr. Fastenberg for a couple of years now. He is extremely knowledgeable, kind and very funny. No matter what our concerns, he has always been able to resolve them.
I am a regular patient of Dr. Fastenberg. He is terrific!
I'm not from around here and have just recently moved to the area. I have gone to numerous dermatologists and not one has been as good as him! When I first was there he had 5 people in the room with him, teaching them and getting input! I have had a great experience so far with him and am happy to know that I have found my go-to guy!
Doc Fastenberg was the best! He was kind and really was very knowledgeable ! Best doc around !
I was glad to see my cut was healing and gave advice in what to do w her. Zap a brown spot by eyebrow awesome . Will decide on how the cysts gel in head to call and get them removed.
Dr. Fastenberg and his assistant Rita were extremely professional while being friendly, respectful and making me feel very comfortable. l highly recommend them and am happy to be his patient.
He's very personable and knowledgable. Explains things so you can understand.
Quick, Kind, competent and professional.
The doctor was a nice person and seemed to care about educating his assistant; however, as a patient I felt very rushed and the diagnosis of my condition left me feeling skeptical at best. After showing him an irritation on my skin, he told me a lot of it could be one thing or it could be another, with no real clarification other than googling images of other people's irritations. I left with a sample of a cream and a prescription that might or might not help, "but it's good to have in the house maybe if someone gets poison ivy". After going to the pharmacy that the Doctor recommended because he said my pharmacy would not have this cream in stock, I was told that with my insurance it would be hundreds of dollars to fill so of course I left the pharmacy. I left the doctor's office feeling worse about my slight skin irritation than when I went in, partially due to the fact that the doctor was throwing grand diagnosis around like I was in an episode of house, but also because for the 2 hours after I left the office, I was trying to call to change the pharmacy that my prescription would be filled at to my own, only to repeatedly be hung up on, transferred to a random mans cell phone who has no affiliations with the doctors office, and on more than one occasion be transferred to the Doctor voicemail box which is full and can not receive messages at this time. When I finally spoke to someone, they told me they were going to have a medical assistant call me back to help me within the hour, it has been over 4 hours and I am now confident I will not be receiving a call back. To say this office failed to meet my expectations is an understatement at best. I am appalled at the treatment I received both by the doctor and the reception staff, and will NOT be going back to this practice ever again.
Good but a little rushed.
Dr. Fastenberg is terrific. Very professional and remembers all my information between visits. I recommend Dr. Fastenberg to anyone looking for a dermatologist
Totally amazed at his reassuring manor the Accuracy of treatment/ diagnosis. He afforded me the time to not only explain but also reviewed my diagnosis with me on the computer, answered all of my questions/ explains the treatment in detail and future treatments and follow-ups.
He was great- smart and engaging. Highly recommend
Staff and Doc were terrific....
Very caring and thorough
Very professional and quick.
He is a caring Dr. I would recommend him to everyone.
My visit was very pleasant indeed. Dr. Fastenberg is my favorite dermatologist ever. I'd recommend to everyone.
Great Doctor. Wouldn't go to anyone else.
He followed through on past treatments as well as new problems I presented. His exam was quick but he listened to me during the time I was there to see him. I feel that I got his full attention during my visit.
I and my family have known Dr. Peredo since our sons played soccer together in the same team. Now I'm told because I haven't been to the office in over three years I'm a new patient I don't like that at all I feel like the practice which was a family practice is now a faceless conglomerate
Dr r Fastenbefg was very thorough and professional. I went in with several problems and he took the time to address them all. The treatments that he has prescribed after my first visit really helped. I am very pleased that he takes the time to listen . I am very happy that I have a doctor that I trust
Dr. Fastenberg is a wonderful Dr., and I would HIGHLY recommend him.
My visit was quick and my concerns were addressed efficiently! An overall pleasant Doctor visit!
Everything was great! This was my first time in the office, and after the paperwork was done, it was less than 5 minutes before I was called in. Then when I was in the exam room, I was seen right away by the nurse to go through some info. Two minutes later a PA came in, and less than five minutes after he left, he came back with the Dr to discuss course of treatment. Overall a highly pleasant experience, not to mention there is a pharmacy in the building so I didn't have to make any additional stops on my way home.
Great experience overall
Visit was very good. He is addressing all my problems and concerns.
Dr Fastenberg is a very thorough doctor who is always friendly and explains everything clearly.
Dr. Fastenberg is great. I am a regular patient of his and would strongly recommend him any time!
Makes my son feel very comfortable and answered all our questions patiently. Made us feel like we were the only patients. Thorough.
He is awesome. So personable. Takes his time with you. Explains everything clearly. Accommodating to your needs. Listens to you. Not pushy with medication. Has your best interest. Super sweet and nice. Always in a good mood. Has appointment times outside of work hours - who wants to/has time to take off for a doctor's appointment?! Has that doctor/patient relationship. The only dermo I feel comfortable with. Don't steal my dermo though!
Dr.Fastenberg has proven to be an exceptional doctor. He immediately was able to diagnose my rare skin condition during a fifteen minute hospital consult and knew exactly what to use for treatment . As far as his bed side manor goes he is very professional and takes adequate time to explain treatments and how the condition affects the body and also seemes to have a vast knowledge of best treatment options. I look forward to seeing him soon.
Dr. Fastenberg was very personable with my teenage son. Quick and thorough visit. Medical assistant was also very friendly and thorough. Front desk could have been a bit friendlier.
Dr. Fastenberg was very professional and his staff was really nice as well. He made me feel confident with his diagnosis and treatment.
Dr. Fastenberg is probably one of the best, friendliest doctor I've ever dealt with. He's super sweet and helpful (obviously lol). I would definitely recommend him to friends and family! I see him for myself and my child and every time we got here he's super sweet to my kid. Definitely a great doctor!
He's been such a great doctor I've ever seen.